They will vote for Biden because they hate Trump.
Everything really hinges on the VP choice. If Joe were to win...then he’d be either removed or asked to step aside in the first month....bringing in the new President. I just can’t see that many independent voters being thrilled with Joe, his positions, or this dementia angle. Some idiot will come up with a campaign slogan....’Be crazy with Joe and vote’. When the debate episode comes up....Trump should decline and say it’s not right to debate a dementia-victim.
I think they hate the Democrat establishment more.