I know all of this has been said before, but fuck it:
At the end of the day, he just didn't have it in him to go as hard against the establishment Dems as he needed to.
I think the propaganda got to him and he genuinely believes it was his fault that Trump won in 2016 and desperately doesn't want to be blamed again (Even tho he totally will be no matter what he says or does).
What we ideally need is basically a leftist version of Trump (As in not prejudiced, but with the same shameless, boisterous, don't-give-a-fuck attitude).
Homie I'm sorry to break it to you, but M4A will never, ever happen. Not from a Bourgeois system in a time when the rate of profit is cratering and a competing power is making imperialism harder and harder. In fact, you're going to see more and more European countries hollowing out their systems as the years go by.