It's already run out. Even if a replacement were rushed into place now, which isn't going to happen, they would start out from a divided Democratic Convention with a couple of months to make a name for themselves, campaigning from scratch. They would still lose, and burn their future chances of running.

I just watched 30 seconds of Biden's address in Nowhereville this afternoon. Pathetic. He stumbled over his words within a second of my hitting play. Just rambled on about 'I told Trump this, I showed him that'. Completely oblivious to reality.

This truly is the nadir of the US democratic system.

And it's about to get far worse.

Come, friendly asteroids!