There's good reason to question whether Biden is up to the job, and if not, he shouldn't be president, let alone running for more.
But otherwise? Dem certainty that he'll lose is nuts. With a bunch more polls in, 538 has him down by 2.3 pct points after a disaster week. That's bupkis!
A Biden who survives the next couple of weeks would have beaten expectations in public and behind closed doors several times, demonstrating that the debate was in fact a one-off bad night. In doing so, he would turn the debate into a normal short-term effect.
