I find it impossible to predict how this turns out. Both Biden and Trump are entirely capable of committing a massive blunder at any time. Maybe Biden has some TV appearance where he comes off like a walking corpse and says some racist shit, maybe Trump fucks up on some policy so royally that conservative independents turn against him en masse, both are entirely possible.

This election, just like the last one, should in theory be a landslide for the Dems. That the race is still open already proves how much they've fucked up. But i wouldn't put it past either candidate that he botches it.