It is sad that Joe is the best thing that democrats can come up with. They will immediately apply the 25th amendment and replace him with the Vice President. Joe will resign and the new President will chose a new Vice President.
https://patriotpost.us/memes/70877-joe-biden-isnt-stupid-2020-05-23
https://en.wikipedia.org/wiki/Twenty-fifth_Amendment_to_the_United_States_Constitution