The problem Biden faces is that, irrespective of his objective capacity, he's lost the confidence of his party. That's fatal to winning a general election--you can't sell someone you don't believe in. You can say that party elites should be more loyal and maybe so but that's the situation
It would be helpful if Democrats didn't go en masse on TV to cement a bad debate performance in the public conversation. I don't think Republicans do this
I find all this stuff about "well replacing him on the ticket would be difficult and risky" to be beside the point. Yes, it would be a difficult high-risk gambit. The alternative though is near-certain defeat
