EDGARTOWN (Massachusetts) • US Vice-President Joe Biden has met Senator Elizabeth Warren, a popular progressive leader with a big support base among Democrats, as he mulls over whether to run for president, according to a source familiar with the matter.
Mr Biden has been huddling with senior advisers to evaluate options for taking on former secretary of state Hillary Clinton, the Democratic front runner who has struggled to overcome fallout from her use of a private e-mail server while working as the nation's top diplomat.
His meeting with Mrs Warren on Saturday is further evidence of how seriously he is considering a run for the party's nomination.
Mrs Warren has a lot of support from liberal-leaning groups that would be critical to winning in early voting states. She has said she does not plan to run for president herself, but she has not endorsed Mrs Clinton or any other Democratic candidate.
Mr Biden's entry into the race would upend the primary process. He has a long history of supporting policies to boost the middle class, an issue that is important to Mrs Warren and which Mrs Clinton has made one of the signature issues of her campaign.
But his late entry into the race and Mrs Clinton's formidable lead in infrastructure and fundraising would put him at a disadvantage.
"He has a resume second to none. He's been an extraordinary partner to this president. And economic viability of the middle class has been his focus and concern throughout his career," said Mr David Axelrod, Mr Obama's chief strategist in his 2008 and 2012 campaigns.
"That said, he is well behind the front runner in polling, money and organisation... Unless the picture changes dramatically, it would be a heavy lift."
Though the Vice-President does not have a formal campaign structure, an outside political "Super Pac" or fundraising group called Draft Biden is laying the groundwork if he decides to join the race.
Draft Biden adviser Steve Schale, a top strategist, said: "Our job is to make sure that if he makes the decision to run ... there's a little bit of infrastructure in place for him to hit the ground."