I’d love to see a true progressive, but there are an awful lot of people who simply won’t vote for one. So I’m sticking with Biden and hoping for the best.
There’s an awful lot of people who also simply won’t vote for someone in Biden’s physical condition. Don’t even need to replace him with someone progressive. Most of his voters are “blue no matter who” people who wouldn’t care if he was replaced.
Biden being replaced by a progressive like AOC or Sanders isn’t even remotely likely though, which is why I didn’t mention all of the people who won’t vote if they’re not motivated to who’d come out for someone like AOC/Sanders/Warren/etc. And replace him with a “moderate” who didn’t support Israel, and you’d get a lot more votes from people who are alienated by that issue.