Warren, who endorsed Biden for president earlier on Wednesday, said: "He's a man who has a good heart, and that's what we need in a leader."
After remaining neutral for months, the former president has officially thrown his support behind his former vice-president.
Kamala Harris introduces Joe Biden during a virtual fundraiser leading to speculation of a potential VP pick and "endorsements" from Twitter.
Trump also said that Obama had to support Biden at some point because "he certainly does not want to see me for four more years."
After weeks of public criticism from the former VP about Trump’s handling of the pandemic, the men scheduled a phone call to talk things out.
The former vice-president claimed a sweeping victory in the Florida, Illinois and Arizona, doubling his delegate lead over Bernie Sanders.
With Florida having 219 delegates up for grabs, should Biden seal a victory there, it could spell trouble for the Sanders campaign.
Booker is just the latest to endorse Biden, who also picked up an endorsement from former rival Senator Kamala Harris.
The former presidential candidate announced Sunday that she would "do everything in my power" to help Biden secure the election.
After a dismal performance on Super Tuesday, billionaire Michael Bloomberg has decided to end his campaign.
Former Vice President Joe Biden won 9 of the 14 states up for grabs, officially turning the Democratic primary into a two-man race.
Rep. Jim Clyburn also took some time to discuss why he thinks the voting order should be changed in the early states to promote diversity.
During Tuesday night's debate in South Carolina, the former vice-president vowed to ensure representation in the nation's highest court.
The endorsement of Rep. Jim Clyburn, an influential Democrat who has served in Congress since 1993, is expected to provide a major boost.
Despite his poor performances in Iowa and New Hampshire, Biden told supporters on a phone call that "I'll be damned if we're gonna lose this nomination."
The 21-year-old Georgia college student asked Biden to explain his poor Iowa Caucus performance only to be blasted with a "joke."