 What do we know about what's going on with the president, with the White House behind the scenes? Why is he staying in this race? We kind of have a mixed picture here. Part of it is personal. Part of it is that Joe Biden really does see himself as the only person who can beat Donald Trump. I'm a nominee to this party because millions of Democrats like you just voted for me in primaries all across America. You voted for me to be your nominee. No one else.