FILE PHOTO: U.S. Vice President Kamala Harris attends an infrastructure event addressing high speed internet in the Eisenhower Executive Office Building's South Court Auditorium at the White House in Washington, U.S., June 3, 2021. / REUTERS/Evelyn Hockstein

U.S. Vice President Kamala Harris made her first public appearance on July 22 since entering the presidential race after President Joe Biden, 81, abruptly abandoned his reelection bid and endorsed her as his successor.

"Joe Biden's legacy over the last three years is unmatched in modern history," Harris said, before delivering remarks at a White House event to honor college athletes.

Harris has moved swiftly to lock up the Democratic presidential nomination, after Biden announced on July 21 he was stepping aside, bowing to pressure from fellow Democrats.

Virtually all of the prominent Democrats who had been seen as potential challengers to Harris have lined up behind her, including Michigan Governor Gretchen Whitmer, California Governor Gavin Newsom and Kentucky Governor Andy Beshear.

It's the first full day of our campaign, so I'm heading up to Wilmington, DE later to say "hello" to our staff in HQ.

One day down. 105 to go. Together, we're going to win this.

— Kamala Harris (@KamalaHarris) July 22, 2024

Campaign officials and allies have already made hundreds of calls on her behalf, urging delegates to next month's Democratic Party convention to join in nominating her for president in the Nov. 5 election against Republican Donald Trump.

Biden's departure was the latest shock to a White House race that included the near-assassination of former President Trump by a gunman during a campaign stop and the nomination of Trump's fellow hardliner, U.S. Senator J.D. Vance, as his running mate.

"My intention is to earn and win this nomination," Harris said in a statement on July 21. "I will do everything in my power to unite the Democratic Party — and unite our nation — to defeat Donald Trump."

Harris, who is Black and Asian American, would fashion an entirely new dynamic with Trump, 78, offering a vivid generational and cultural contrast.

The Trump campaign has been preparing for her possible rise for weeks, sources told Reuters. It sent out a detailed critique of her record on immigration and other issues on July 22, accusing her of being liberal than Biden.

The Trump campaign accused Harris of favoring abolishing the U.S. Immigration and Customs Enforcement agency and decriminalizing border crossings, backing the so-called Green New Deal, supporting the administration's electric vehicle mandates and encouraging "defund the police" efforts.

Some of those were positions Harris adopted as an unsuccessful presidential candidate in the 2020 election when she was running on a more liberal agenda than Biden but were not ones that the administration assumed, particularly with regard to border security and law enforcement issues.

Biden, the oldest person ever to have occupied the Oval Office, said he would remain in the presidency until his term ends on Jan. 20, 2025, while endorsing Harris to run in his place.

Biden's shaky June 27 debate performance against Trump led the president's fellow Democrats to urge him to end his run, but senior Republicans have demanded he resign from office, arguing that if he is not fit to campaign, he is not fit to govern.

Harris spent July 21 working the phones, dressed in a Howard University sweatshirt and eating pizza with anchovies as she spoke with Pennsylvania Governor Josh Shapiro, a potential vice presidential running mate, House Democratic leader Hakeem Jeffries, and Congressional Black Caucus chair Representative Steven Horsford, according to sources.

Biden's withdrawal leaves less than four months to wage a campaign. Despite the early show of support for Harris, talk of an open convention when Democrats gather in Chicago on Aug. 19-22 was not totally silenced.

Former House Speaker Nancy Pelosi and former President Barack Obama did not announce endorsements, although both praised Biden.

With Democrats wading into uncharted territory, Democratic National Committee Chair Jaime Harrison said the party would soon announce the next steps in its nomination process.

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Biden won the party's nomination in 2020, picked Harris to be his vice president, and went on to beat Trump. She is a former California attorney general and a former U.S. senator.

Harris is expected to stick largely to Biden's foreign policy playbook on such issues as China, Iran and Ukraine, but could strike a tougher tone with Israel over the Gaza war if she tops the Democratic ticket and wins the November election.

She has been outspoken on abortion rights, an issue that resonates with younger voters and more liberal Democrats.

Proponents argue she would energize those voters, consolidate Black support and bring sharp debating skills to prosecute the political case against the former president.

But some Democrats were concerned about a Harris candidacy, in part because of the weight of a long history of racial and gender discrimination in the United States, which has not elected a woman president in its nearly 250-year history.

Polling shows that Harris performs no better statistically than Biden had done against Trump.

In a head-to-head match-up, Harris and Trump were tied with 44 percent support each in a July 15-16 Reuters/Ipsos poll conducted immediately after the July 13 assassination attempt on Trump.

Trump led Biden 43 percent to 41 percent in that same poll, though the 2 percentage point difference was not meaningful considering the poll's 3-point margin of error.

Biden's campaign had $95 million on hand at the end of June, according to a filing with the Federal Election Commission. Trump's campaign ended the month with $128 million. Campaign finance law experts disagree on how easily that money could be shifted to a Harris-led campaign.

Harris' campaign had raised $49.6 million in less than 24 hours after Biden's exit, a campaign spokesperson said on July 22.

More than 44,000 Black women and allies, including Representatives Maxine Waters, Jasmine Crockett and Joyce Beatty, joined a three-hour call on July 21 evening in support of Harris's bid, raising more than $1.5 million for her presidential campaign, organizers told Reuters.

Biden has not been seen in public since testing positive for COVID-19 on July 17. He was isolating at his home in Rehoboth Beach, Delaware, and tentatively plans to meet Israeli Prime Minister Benjamin Netanyahu on Tuesday if he has recovered.