@blatham,
I think a little talked about truth in this whole period of jockeying between Biden and Bernie for who gets to wear the Democratic mantle this November is the visceral distaste for Sanders that a lot of people have - for Sanders himself, not his employees, not his followers. I think a hell of a lot of people see him as a self-righteous old man with borderline messianic delusions. I think people don't say it because he styles himself as the voice of the voiceless little guy, and who wants to attack Robin Hood?
Another thing -
I keep seeing people say "It's not Bernie - it's just a mean group of his supporters" who produce all that bile that everyone has encountered on the web. But Bernie is a smart guy and not naive - he knows damn well what kinds of stink his people raise, and he knows they would listen to him if they really thought he wanted them to cease and desist from their asshattery. But we go on from month to month and year to year with everyone knowing the bitter divisiveness in the Democratic Party comes mostly from Bernie's camp; and everyone (including Bernie) pretending that Bernie has nothing to do with it.