My "support" (since you'll call it that anyway) is that he isn't a Democrat/Liberal puppet. Given lack of proof of anything truly criminal or grossly unethical, that is all I need. Been saying the same thing for 4+ years, while I waited, and waited, and waited for the Dems/Libs to come-up with all this proof they keep promising, but it has never appeared. I've admitted Biden may be the "better" man to be POTUS, but I don't trust his ability to buck the growing trends within the Party he represents, and feel is choice of VP candidate shows evidence of that.
As for the debate, I honestly didn't watch a single second. If I want to hear two old dudes tossing BS back-and-forth for a couple hours, I'd rather go to the Barber Shop and listen to it be about who was the better HS athlete in the 70s or 80s.