Biden, sources say, regrets not running for office in 2016, and if he does decide to run again, he doesn’t want unforced errors to hamper his chances.

“My sense from talking to him is that he would love the opportunity to do it,” one Democratic operative close to Biden said of a potential White House run. “He’s doing the things he needs to do, he’s stepping up to be a leader of the party — and the party needs it — and his poll numbers look good.”

A Morning Consult and Politico poll released on Monday shows Biden leading handily among other potential Democratic candidates, including Sen. Elizabeth Warren (Mass.).