If you’re going to do the thing with replacing Biden as the candidate, you couldn’t get better than AOC, who will be 35 before November.
I personally think replacing Biden this late is a bad move even though I already think Biden sucks. But I grit my teeth and voted for the fucker just like I did with Clinton, because the alternative is literally insanity and fascism. I just don’t realsitically seeing the party coalesce around anyone new at the last minute. Organizing Democrats is like herding cats, being a big tent party sucks noodles.