 He called Biden a patriot of the highest order. Just days ago, there were reports that the former president had lost confidence in Biden's chances for reelection. While Obama has yet to make a formal endorsement, a number of high-profile Democrats have. Massachusetts Senator Elizabeth Warren said Harris will have no lack of options when it comes to choosing a running mate. I think she's got a lot of good people out there she can pick from. We've got a deep bench, and that's good.