Kamala Harris was the most likely immediate replacement for Joe Biden after his June 27, 2024, debate performance—but she would not have inherited the Democratic nomination automatically. Harris had the strongest combination of institutional support, campaign infrastructure, national recognition and access to the existing Biden-Harris fundraising operation.
The strongest non-Harris possibilities were Michigan Gov. Gretchen Whitmer, California Gov. Gavin Newsom and Pennsylvania Gov. Josh Shapiro. Transportation Secretary Pete Buttigieg and Illinois Gov. J.B. Pritzker were also credible, though each faced significant obstacles. This was the situation on June 28, 2024. Biden later withdrew on July 21, endorsed Harris and cleared the way for her to become the Democratic nominee.
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The short answer
If Biden had ended his reelection campaign immediately after the debate, the Democratic Party would not have simply installed a replacement by presidential succession rules. Biden would have remained president unless he separately resigned or otherwise vacated the office. The Democratic Party would have needed to select a new presidential nominee through its delegate and convention procedures.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsIn that hypothetical nomination contest, the candidates fell into three broad groups:
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- Most likely immediate successor: Kamala Harris, because she was already vice president, Biden’s running mate and part of the existing campaign structure.
- Most credible non-Harris contenders: Gretchen Whitmer, Gavin Newsom, Josh Shapiro, Pete Buttigieg and J.B. Pritzker.
- Frequently mentioned but unlikely options: Michelle Obama, Bernie Sanders, Elizabeth Warren, Amy Klobuchar, Jared Polis, Raphael Warnock, Wes Moore, Andy Beshear and Dean Phillips, among others.
The key distinction is between a person who was legally eligible to seek the nomination, a person who might have been politically attractive and a person who could realistically assemble delegate support, money, staff and ballot access in roughly four months.
Contemporary reporting identified Harris, Whitmer, Newsom, Shapiro, Buttigieg and Pritzker as the serious names under discussion. That was an analytical assessment, not an official Democratic shortlist. See the contemporary Washington Post analysis and Semafor’s June 28 reporting.
Why Biden’s debate made the question urgent
Biden and Donald Trump debated in Atlanta on June 27, 2024. Biden’s halting delivery, moments of apparent confusion and difficulty completing some answers intensified concerns that had existed before the debate about his age and ability to campaign and serve for another term.
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Trump also made false or problematic claims during the debate, but the immediate Democratic reaction focused overwhelmingly on Biden’s performance. The Associated Press describes how the debate inflamed existing age concerns and eventually preceded Biden’s withdrawal. Read the AP’s account of the withdrawal and its aftermath.
How the replacement process would have worked
Dropping out of the campaign is not the same as resigning as president
Two separate questions were often blurred together:
- Who would be president? If Biden had resigned from the presidency, Vice President Harris would have become president under the constitutional succession process. If Biden merely stopped seeking reelection, he would have remained president through the end of his term.
- Who would be the Democratic nominee? The Democratic Party would have had to select a replacement nominee under its party rules. Becoming vice president does not automatically confer the party’s presidential nomination.
Neither Congress nor the Supreme Court would have selected the Democratic nominee. The nomination was a party and delegate matter, subject to the party’s rules and state ballot-access requirements. The Congressional Research Service’s explanation of the replacement process outlines why the presidential office and the party nomination needed to be treated separately.
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Biden’s delegates were not personal property
Biden had won nearly all of the Democratic primary delegates and had been the clear presumptive nominee. But his delegates were not a personal asset that he could legally hand to Harris or another candidate.
His withdrawal would have created a vacancy before the convention. Delegates could then support another candidate, and Biden’s endorsement would probably have had enormous political influence. The practical effect might have looked like a transfer of support, but it would still have required delegates to act under the Democratic Party’s rules.
The 2024 Democratic convention rules required pledged delegates to act in “good conscience” and reflect the sentiments of the people who elected them. A presidential nominee needed a majority vote of eligible convention delegates. The official 2024 Democratic convention call sets out those requirements.
Who could qualify?
Under the convention call, a candidate generally needed to:
- Publicly declare an intention to seek the Democratic presidential nomination.
- Affirm that they were a Democrat.
- Demonstrate substantial support.
- Obtain written approval from the proposed nominee for nomination.
- Submit a petition signed by delegates representing at least 300 delegate votes, with no more than 50 votes coming from any one delegation.
Those requirements meant that simply being a prominent Democrat was not enough. A potential candidate needed to move quickly, win the backing of delegates and demonstrate enough support to qualify for a ballot.
Ballot access created another deadline
A replacement nominee would also have faced state-by-state ballot-access deadlines and possible litigation. Ohio’s ballot deadline was one reason Democrats were concerned about completing the nomination process in time. Replacing Biden was not automatically illegal in every state, but it was also not a frictionless process that the party could ignore.
The Democratic Party ultimately used a virtual roll call after Biden’s withdrawal. Candidates had to declare their intent by July 27, 2024, and obtain at least 300 delegate signatures. Harris was the only candidate to meet the threshold, so no contested virtual ballot was necessary. The DNC’s adopted virtual-roll-call rules explain the process.
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Candidate ranking: who had the best chance?
This ranking is not an official party list. It weighs the factors that mattered in late June 2024: institutional access, existing staff and data, financing, national recognition, battleground-state credibility, coalition breadth, vulnerability to Republican attacks, willingness to run and the limited time before Election Day.
| Candidate | Why the candidate was plausible | Main obstacle | Assessment |
|---|---|---|---|
| Kamala Harris | Vice president, Biden’s running mate, national profile and existing campaign connection | Weak approval ratings and close association with Biden’s record | Most likely immediate replacement |
| Gretchen Whitmer | Popular Michigan governor with a strong battleground-state record | No prepared national campaign for a late-June launch | Strongest non-Harris alternative |
| Gavin Newsom | Nationally visible governor, fundraiser and experienced media communicator | California vulnerabilities and no clear delegate coalition | Serious contender |
| Josh Shapiro | Popular Pennsylvania governor with a large statewide victory | Limited national organization and relatively short executive record | Serious contender |
| Pete Buttigieg | Prior presidential campaign, national recognition and strong communication skills | No statewide electoral record and coalition concerns | Credible but difficult path |
| J.B. Pritzker | Governor, major Democratic donor and politically connected executive | Less national recognition and no battleground-state record | Plausible contender |
| Raphael Warnock | Black senator from competitive Georgia with a recent statewide victory | No executive experience and no obvious emergency campaign structure | Second tier |
| Jared Polis | Strong Colorado electoral record and a business-oriented image | Limited national profile and a safe-blue home state | Second tier |
| Michelle Obama | Extremely high public favorability | Repeatedly said she did not want to run | Speculative or fantasy option |
1. Kamala Harris: the overwhelmingly most likely immediate replacement
Harris had the clearest institutional path by a wide margin. She was already vice president, already part of the Biden-Harris ticket and already connected to the campaign’s staff, donors, voter data and legal structure. Biden’s endorsement would also have given her a powerful argument to the delegates who had been elected on his ticket.
She could have offered continuity with the Biden administration while also presenting a generational contrast with Trump. That combination mattered: Democrats could argue that they were not abandoning the administration’s agenda while still responding to concerns about Biden’s age.
Harris also had the strongest practical position on campaign money. She was already part of the Biden-Harris campaign structure, giving her a substantially stronger claim to the existing funds than an unrelated replacement candidate would have had. Campaign-finance experts debated the precise mechanics, so it is more accurate to call this a major legal and operational advantage than an automatic transfer of money. The AP’s reporting on Harris and the campaign funds, the FactCheck.org analysis and the Federal Election Commission’s transfer rules provide useful context.
Harris’s weaknesses
Harris was not an uncontested choice. Her national approval ratings were poor, her 2020 presidential campaign ended early and she was closely tied to Biden’s vulnerabilities on inflation, immigration and age. Some Democrats also questioned her political effectiveness and general-election appeal.
There was a separate coalition issue. Bypassing the first Black woman vice president could have created a serious legitimacy problem with Black voters and other core Democratic constituencies. That did not make her nomination automatic, but it made the political cost of ignoring her unusually high.
Polls asking voters to select a replacement did not settle the question. Voters might prefer a different candidate in an abstract survey, while delegates and party leaders might choose the person who could legally and operationally take over an existing campaign. Harris had the strongest answer to that second question.
2. Gretchen Whitmer: the strongest non-Harris alternative
Whitmer offered perhaps the best theoretical case for a fresh start. She was governor of Michigan, a central battleground state, and had won two statewide races, including reelection in 2022 by roughly 10 percentage points. Her approval ratings in Michigan were relatively strong, and she could present herself as a younger Midwestern executive with a record of governing.
Michigan also gave her a direct Electoral College argument. A Democratic nominee who could win the state where Whitmer served might reassure strategists worried about the party’s performance in the industrial Midwest. She was already a Biden campaign co-chair and prominent surrogate, so she was not an unknown figure inside the party.
But Whitmer’s political strength and her immediate nomination probability were different things. She had not been preparing a 2024 presidential campaign. A late-June launch would have required national fundraising, staffing, messaging, opposition research, delegate outreach and ballot-access work almost immediately. Her success in Michigan also could not automatically be transferred to a national race against Trump.
Whitmer publicly supported Biden at the time. That public loyalty was consistent with her role as a campaign surrogate, but it also meant she was not positioned as an active challenger when the speculation began.
3. Gavin Newsom: the best-prepared national campaigner outside the administration
Newsom had built a national profile before the debate. As governor of California, he had the platform of leading the nation’s most populous state. He regularly appeared on national television, attacked Republican governors and cultivated a reputation as an aggressive Democratic communicator.
He was a strong fundraiser and had already been campaigning for Biden. His prominent role in the debate’s spin room showed that he could immediately speak to a national audience. If Democrats wanted a candidate who could quickly define a contrast with Trump, Newsom had more media and political preparation than most governors.
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Newsom also publicly rejected the idea that he would replace Biden. It would be inaccurate to state as fact that he was running a “shadow campaign.” He was widely viewed as a future presidential contender, but on June 28 he was publicly supporting Biden rather than declaring a candidacy.
4. Josh Shapiro: the strongest battleground-state profile
Shapiro had a particularly direct electoral argument. He was governor of Pennsylvania, one of the most important states on the Electoral College map. He had won the 2022 governor’s race by a large margin after previously serving as Pennsylvania’s attorney general, giving him more statewide experience than many first-term governors.
Contemporary coverage emphasized his popularity, bipartisan image and potential ability to attract some Republican voters. Democrats could argue that a Pennsylvania nominee would understand the state’s voters and regional concerns better than a national figure from a safe state.
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Shapiro was therefore a serious emergency possibility and a strong future presidential contender, but he was less institutionally likely than Harris and less nationally prepared than Newsom or Buttigieg.
5. Pete Buttigieg: the strongest communicator, with coalition concerns
Buttigieg had something the governors did not: recent presidential campaign experience. He nearly won the Iowa and New Hampshire Democratic contests in 2020, had built national donor and media networks and had become a visible member of the Biden administration as transportation secretary.
He was widely regarded as an articulate television communicator. He could have offered a sharp generational and rhetorical contrast with Trump and would not have needed to learn the mechanics of a national presidential campaign from scratch.
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His weaknesses involved coalition-building and electoral experience. His 2020 campaign struggled to build durable support among Black voters and other key Democratic constituencies. He had never won statewide office and was a cabinet secretary rather than a governor or senator with a current electoral base.
Buttigieg was a credible national candidate, but his case rested more on communication skills and presidential-campaign experience than on an obvious path to a majority of Democratic delegates. The party might also have been reluctant to respond to pressure for a more broadly representative replacement by choosing another white male candidate.
6. J.B. Pritzker: financially powerful and politically viable
Pritzker was a genuine possibility in a rushed process. He was governor of Illinois, had won reelection in 2022 with a large vote share and had substantial personal wealth that could help finance a rapid launch. He also had a national political profile greater than that of many governors and was frequently included in contemporary replacement speculation.
His wealth would have solved only one part of the problem. Money can pay for advertising and staff, but it cannot instantly create national voter familiarity, delegate relationships, a complete field operation or a persuasive reason for voters outside Illinois to support a candidate.
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Illinois is also reliably Democratic, so Pritzker could not point to a record of winning in a presidential battleground state in the way Whitmer or Shapiro could. He had spent the campaign defending Biden rather than openly preparing to replace him. That made him plausible, but not an obvious front-runner.
Credible second-tier names
Raphael Warnock
Warnock offered a compelling battleground-state profile after winning Georgia’s 2022 Senate runoff. A Black senator from a competitive Southern state could have helped Democrats with African American voters while keeping Georgia central to the Electoral College strategy.
He lacked executive experience and would have had to leave a Senate seat to enter an emergency nomination contest. There was also no obvious indication that he was preparing to launch a presidential campaign on short notice. Warnock was electorally interesting, but not among the most likely immediate replacements.
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Jared Polis
Polis had a strong electoral record as Colorado’s governor, a business-oriented image and some bipartisan appeal. He was a plausible future national candidate. In 2024, however, Colorado was not a decisive battleground, and Polis had less national visibility than Newsom, Whitmer or Buttigieg.
Wes Moore
Moore was a rising Democratic governor with a strong biography and substantial future potential. But he had been governor of Maryland for less than two years in June 2024 and lacked the national organization needed for a four-month presidential sprint. He belonged on a broad list of future prospects rather than at the top of an emergency-replacement ranking.
Andy Beshear
Beshear had shown that a Democrat could win statewide in Kentucky, a heavily Republican state. That made him electorally interesting and gave him a bipartisan governing argument. His national profile and campaign infrastructure, however, were too limited for him to rank among the most likely immediate replacements.
Amy Klobuchar
Klobuchar had statewide experience, a moderate image and a prior presidential campaign. But her 2020 campaign failed to gain enough national traction, and she did not have an obvious institutional route to win a late 2024 convention. She was plausible in theory, but unlikely in practice.
Names that were mostly speculative
Michelle Obama
Michelle Obama was frequently mentioned because of her high favorability and national recognition. But she had repeatedly said she did not want to run for president. On the public evidence available at the time, she was a “break-glass” or fantasy option—not a realistic emergency candidate.
Bernie Sanders
Sanders had national recognition and a loyal progressive base, but he was older than Biden and had endorsed Biden. His age made him a poor answer to the central problem exposed by the debate. A Sanders candidacy would also have required him to reenter a Democratic nomination contest he had already lost twice.
Elizabeth Warren
Warren had national recognition and prior presidential-primary experience, but she had already lost the 2020 nomination contest and lacked an obvious late-stage institutional route to a majority of delegates.
Dean Phillips
Phillips had actually challenged Biden in the 2024 Democratic primary, largely on age and generational-change grounds. But he withdrew after receiving little support. He was relevant to the story of Biden’s critics, not a serious replacement contender. Contemporary coverage of the possible replacements included this distinction.
Robert F. Kennedy Jr. and Cornel West
Neither Kennedy nor West was a realistic Democratic replacement. They were running outside the Democratic Party structure. Including them in a list of Democratic nominees would confuse the party’s nomination process with the broader question of who else was running for president.
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The hypothetical was not a normal presidential primary. There were roughly four months between the debate and Election Day. A replacement candidate needed to do more than appeal to Democratic voters. The candidate needed to take over or recreate a national operation under extreme time pressure.
The relevant factors were:
| Factor | Why it mattered |
|---|---|
| Institutional path | Could the candidate quickly gain support from Biden delegates, party leaders and Democratic governors? |
| Existing campaign structure | Could staff, voter data, field offices, communications systems and fundraising operations be activated immediately? |
| Financial access | Could the candidate use existing funds or replace them without losing critical campaign time? |
| National recognition | Could voters learn enough about the candidate before November? |
| Battleground credibility | Did the candidate have an electoral record in Michigan, Pennsylvania, Georgia, Wisconsin or another decisive state? |
| Coalition breadth | Could the candidate retain Black voters, young voters, progressives, moderates and union voters? |
| Message discipline | Could the candidate explain why replacing Biden was necessary without discrediting the administration? |
| General-election vulnerabilities | What attacks could Trump and Republican groups immediately deploy? |
| Willingness to run | Had the candidate shown actual interest, or had journalists merely mentioned the name? |
| Time feasibility | Could the candidate build a credible national campaign in about four months? |
Harris was the only plausible replacement who combined nearly all of these advantages. Whitmer and Shapiro had stronger direct battleground-state arguments. Newsom had a more developed national media and fundraising profile. Buttigieg had presidential campaign experience. Pritzker had wealth and executive experience. But none had Harris’s combination of the vice presidency, the Biden endorsement, the existing ticket and the campaign’s operational infrastructure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.The central trade-off: Harris versus a fresh candidate
Why Democrats might have chosen Harris
- She could preserve continuity with the Biden administration.
- She was already known nationally.
- She could inherit Biden’s endorsement and much of his delegate support.
- She had the strongest practical connection to the campaign’s staff, data and funds.
- Bypassing her could have alienated important Democratic constituencies.
Why Democrats might have preferred someone else
- A fresh candidate could make the election about the future rather than Biden’s age.
- A governor could point to an executive record and, in Whitmer’s or Shapiro’s case, a battleground-state record.
- Harris inherited responsibility for Biden’s record, including vulnerabilities on inflation, immigration and age.
- Some Democrats viewed Harris’s own approval ratings and prior 2020 campaign as liabilities.
This was why “best candidate” and “most likely nominee” were not necessarily the same answer. A party might privately prefer a fresh start while still concluding that Harris had the only workable path under the calendar and campaign-finance constraints.
What the polls did—and did not—show
Post-debate polling confirmed that many voters wanted a change, but it did not predict a convention result. A Morning Consult survey found that 60% of voters said Biden should definitely or probably be replaced. Harris was the leading individual alternative among Democrats, although her support was far from overwhelming. An ABC News/Washington Post/Ipsos poll also placed Harris ahead of named alternatives including Newsom, Buttigieg and Whitmer. See Morning Consult’s post-debate analysis and the ABC/Washington Post/Ipsos survey.
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Those results require careful interpretation:
- A preference poll is not a delegate poll. The people answering a survey were not necessarily the delegates who would choose the nominee.
- Many respondents had little or no opinion. Less nationally known governors could perform differently after receiving sustained exposure and the Democratic label.
- Familiarity can distort early hypotheticals. Better-known candidates often perform better before voters have heard detailed arguments for or against less familiar candidates.
- A nomination would change the campaign environment. A nominee would receive unified party support, major advertising and extensive media coverage.
- Early head-to-head numbers were unstable. Polls taken before a replacement candidate had run a single general-election advertisement could not reliably predict November performance.
The polls helped measure voter concern about Biden and initial familiarity with alternatives. They did not resolve the competing questions of delegate unity, ballot access, campaign money, organization or the best general-election coalition.
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What actually happened
The hypothetical became real, but the process was more orderly than the open-convention scenarios suggested:
- June 27, 2024: Biden debated Trump in Atlanta.
- July 21, 2024: Biden ended his reelection campaign and endorsed Harris.
- August 1–5, 2024: Democratic delegates conducted a virtual roll call.
- August 5–6, 2024: Harris was formally certified as the Democratic presidential nominee and Tim Walz as the vice-presidential nominee.
- November 5, 2024: Harris and Walz lost the general election to Donald Trump and J.D. Vance, according to the Federal Election Commission’s official results.
The DNC later announced the virtual-roll-call results and the formal certification of the ticket. The DNC’s roll-call announcement and its certification announcement document those steps.
Harris’s eventual nomination does not mean she was legally guaranteed the position on June 28. It does show why she was the most likely immediate replacement: once Biden endorsed her, the institutional, financial and delegate advantages converged around the person already on his ticket.
Common misconceptions
“Harris automatically became the nominee.”
False. Biden’s withdrawal created a vacancy. Harris still needed delegate support and formal certification.
“Biden could transfer his delegates to Harris.”
That is misleading. Biden’s endorsement could strongly influence delegates, but the delegates were governed by party rules rather than owned personally by Biden.
“The DNC could simply choose any Democrat.”
Too broad. The party had to follow its convention rules, candidate-qualification procedures, virtual-roll-call rules and state ballot-access requirements.
“The vice president becomes president when the president drops out.”
Only if “drops out” means vacating the presidency. Ending a reelection campaign does not create a presidential vacancy.
“The replacement who led a poll was the most likely nominee.”
Not necessarily. Delegate relationships, party support, money, organization, willingness to run and ballot access were at least as important as early voter preference.
“Michelle Obama was a serious emergency option.”
Her favorability made her a recurring hypothetical, but her repeated statements that she did not want to run made an actual candidacy highly unlikely.
Bottom line
On June 28, 2024, the most accurate answer was Kamala Harris. She was not automatically entitled to the nomination, but she had the clearest institutional and financial path to it. The strongest fresh-start alternatives were Gretchen Whitmer, Gavin Newsom and Josh Shapiro, followed by Pete Buttigieg and J.B. Pritzker.
The decisive issue was not simply which Democrat might poll best in a hypothetical matchup. It was which candidate could unite Biden’s delegates, access a functioning campaign, raise or legally use the necessary money, meet party rules, solve ballot-access problems and introduce themselves to the country before November. Harris ultimately won that practical contest after Biden withdrew and endorsed her.
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Would Kamala Harris have automatically become the Democratic nominee if Biden dropped out?
No. Harris would have become president only if Biden vacated the presidency, such as by resigning. If Biden merely ended his reelection campaign, the Democratic Party’s delegates would have selected a new nominee under party rules. Harris had the strongest institutional path, but the nomination was not automatic.
Who was the strongest non-Harris replacement candidate?
Gretchen Whitmer had the strongest theoretical case because of her Michigan record, statewide victories and Midwestern profile. Gavin Newsom was more nationally prepared, while Josh Shapiro offered a strong Pennsylvania battleground argument. Which one was “strongest” depended on whether the priority was electoral geography, national readiness or delegate-building ability.
Could an unrelated Democrat have used Biden’s campaign money?
Not automatically. Harris had the strongest practical and legal claim because she was already part of the Biden-Harris campaign structure. An unrelated candidate would have faced campaign-finance restrictions and might have needed to build a new fundraising operation. The precise legal mechanics were debated by campaign-finance experts.
What happened after Biden withdrew?
Biden withdrew on July 21, 2024, endorsed Harris and did not trigger a prolonged contested convention. Harris was the only candidate to meet the later virtual-roll-call petition threshold, and she was formally certified as the Democratic nominee in early August. She and Tim Walz lost the November general election to Donald Trump and J.D. Vance.
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Bottom line: Harris was the most likely immediate replacement because she had the vice presidency, Biden’s endorsement, the existing ticket and the strongest access to campaign infrastructure and money. Whitmer, Newsom and Shapiro were the leading non-Harris alternatives, with Buttigieg and Pritzker also credible. But none was automatically entitled to the nomination, and the 2024 outcome ultimately depended on delegate rules, campaign-finance logistics and ballot access as much as on public polling.
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