KAMALA HARRIS, 55. CALIFORNIA SENATOR
Following widespread protests over racial injustice and police brutality, pressure increased on Biden to choose a woman of color. Harris, the daughter of Jamaican and Indian parents, fits the bill.
Harris is widely viewed as a favorite to run alongside Biden. She is a battle-tested former presidential candidate and ex-prosecutor who has shown an ability to go on the attack - a valued asset for a running mate. A first-term senator from California, she has already been heavily vetted by the media and rival campaigns.
Harris endorsed Biden after dropping out of the race. But her criticism of him during a Democratic primary debate about his opposition to school busing rankled some people close to Biden, who worry about her ambition and loyalty.
Family life: Married to Douglas Emhoff, with two adult stepchildren.
SUSAN RICE, 55. FORMER NATIONAL SECURITY ADVISOR
Rice served as President Barack Obama's national security adviser during his second term, where she worked hand in hand on foreign policy matters with Biden, who was Obama's vice president.
Prior to that, Rice served as U.S. ambassador to the United Nations under Obama and has advised several other Democratic presidential candidates on national security.
A Black woman, Rice could help drive the African-American vote, the Democratic Party´s most loyal constituency. But she has never run for public office, which means she would be untested on the campaign trail. Her involvement in the controversy over the 2012 attack on the U.S. mission in Benghazi, Libya, could revive that incident as a campaign issue.
Family life: Married to former ABC News executive Ian Cameron with son and a daughter; son John is a Trump supporter
VAL DEMINGS, 63. FLORIDA CONGRESSWOMAN
Biden has said Demings, an African-American congresswoman from the election battleground state of Florida, is on the shortlist for running mate.
The former Orlando police chief served as one of the managers of the House of Representatives' impeachment proceedings against Republican President Donald Trump but has a lower profile among voters nationally.
Demings' background in law enforcement and her relatively unvetted past as police chief could be viewed as risk factors to a Biden campaign that wants to appeal to progressive voters.
Family life: Married to Jerry Demings, current mayor of Orange County, Florida, with three adult children
KAREN BASS, 66. CALIFORNIA CONGRESSWOMAN
A late addition to Biden's shortlist, Bass, a congresswoman from Southern California and chair of the Congressional Black Caucus, would add a progressive voice to the ticket.
Bass has an extensive background in police reform efforts and has spearheaded the legislative response in the House to the killing of George Floyd by police in