Because he's clearly way less sharp than he was even four years ago. I'm not going to pretend Democrats chose someone who's especially fit to be president. Apparently skating by on decades of stockpiled goodwill is enough. Wonder why he was able to accumulate so much while the last, and obviously sharper, nominee was not...
agreed, he's been hidden due to the virus and I think his luck will eventually run out. We saw how lost he looked in that Breakfast club interview...
Just because you say something doesn't make it true.