When Harris was still in the 2020 primary race, she was one of Biden's toughest rivals, consistently sparring with him during televised debates.
But after Harris ended her campaign in December 2019, she has emerged as one of the most frequently mentioned running mates for Biden.
At a relatively young 55 years of age, she would help balance a ticket with a septuagenarian at the top. Her resume includes a stint as California's attorney general, and she has served over three years in the U.S. Senate.
Nominating Harris would also diversify the presidential ticket, which many Democrats would like to see given that the 2020 race began as the most diverse field in history only to narrow to a white man.
Another erstwhile 2020 opponent that might make Biden's shortlist is Klobuchar, who ran on a moderate platform.
A major part of Klobuchar's pitch was her ability to speak to working class, white voters in the Midwest, a segment of voters that Democrats have fixated on winning back from Trump in 2020.
With the party's eye on recapturing Midwestern swing states like Michigan, Ohio, Wisconsin and Pennsylvania, Klobuchar's Minnesota roots might give her an advantage in the veepstakes.
The Michigan governor, whose race was one of the most closely watched of the 2018 midterms, has risen to new prominence during the coronavirus pandemic.
Whitmer has not shied away from sparring publicly with President Trump, who has attacked her from the White House podium and referred to her as "the woman from Michigan,"as her state deals with a rising outbreak.
But the best indication of her chances for the vice presidential nomination came from Biden himself, who told MSNBC on March 31 that he was considering her as a running mate.
"She made the list in my mind two months ago," Biden said.
Like Klobuchar, Whitmer also represents a Midwestern state, and Democrats are eager to reclaim Michigan from the Republicans in November.
No candidate — male or female — electrified Democratic politics in 2018 the way that Stacey Abrams did. After serving as the minority leader of Georgia's state assembly, she turned her eyes on the governor's mansion.
In her challenge to Georgia's then Secretary of State Brian Kemp, Abrams became the first black woman to become a major party nominee for governor, and her race was the most closely watched of the midterm election.
Though she lost by a narrow margin, Abrams' profile has only grown since her defeat. She founded Fair Fight 2020, a voting rights organization, and delivered the 2019 Democratic response to Trump's State of the Union address.
And she has been very public about her willingness to serve as the vice president.
"I would be an excellent running mate," she said in an interview published in Elle magazine on April 15.
"I have the capacity to attract voters by motivating typically ignored communities," she continued. "I have a strong history of executive and management experience in the private, public, and nonprofit sectors. I've spent 25 years in independent study of foreign policy. I am ready to help advance an agenda of restoring America's place in the world. If I am selected, I am prepared and excited to serve."
Rep. Jim Clyburn, the South Carolina congressman credited with delivering the state to Biden, thereby saving his candidacy, has repeatedly indicated he would like to see Biden choose a black woman as his running mate.
In addition to Harris and Abrams, Clyburn has also mentioned Demings, a two-term congresswoman from Florida with a background in law enforcement, as an ideal running mate for Biden.
She was the first woman to hold the position of Orlando police chief, and once in Congress, Speaker Nancy Pelosi selected her as one of the impeachment managers in Trump's Senate trial this year.
Much like Harris, Cortez Masto is a relatively young senator serving a diverse state, with a former background in law enforcement.
The former Nevada attorney general made history with her 2018 election, becoming the first Latina to serve in the U.S. Senate.
After Biden promised to nominate a woman in March, Latino Victory, an advocacy group, publicly touted her as a potential candidate.
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