I don’t get why so many are still so shocked and surprised (and sore and resentful?) that more Democrats voted for Biden instead of Bernie in the primaries? Bernie, after all, is not a Democrat, and has never been elected or held office as a Democrat. He’s always run as an Independent in the Senate and his previous offices. The only time he’s ran on the Democrat ticket was during the presidential primary seasons for 2016 and 2020.
Bernie is clearly still more progressive than most Democrats are ready for. The primary voters made that quite clear. Granted, the party seems to be moving in the progressive direction (look how far Bernie got in the race), but the party clearly is not there yet in most states. His seeming early lead was an artifact of the demographics of some of the early primary states. Once many of the other states got in their say, he lost that lead. It’s pointless to keep throwing a tantrum that an outside candidate failed to switch parties and instantly have everyone in that party on-board with his ideals. Most Democrats are more comfortable with Biden’s policies and history than with Bernie’s. That’s all there is too it. Just be thankful that Bernie was able to get the Democrats to take his policy positions seriously, and even have other Democrats (including Biden) swing in that direction (we have yet to see if any of Bernie’s policy positions end up getting taken on as official Democratic Party positions at the convention)
Biden has been a Democrat a long time, and represents what most democrats want. Bernie is an outsider candidate who has never actually been elected as a Democrat, so it should not be surprising that Democratic primary voters feel more aligned with Biden than Bernie.
I think a large portion of the enthusiasm for Bernie has come not from Democrats, but from Independents, and the primary results reflect that.
(Disclaimer, I’m registered as an Independent myself, so could not vote in the Democratic primary in my state. I personally feel more aligned with Bernie’s policies, but that’s why I’ve never been registered as a Democrat.)