No mystery about it: after South Carolina a bunch realized they couldn't win.

Because everyone besides Bernie dropped out right before Super Tuesday and endorsed Biden, hoping to get appointments in a future Biden Admin. Many, like Buttigeg were well rewarded for this.

The Democrats even tried to drop the primary here in New York by striking Bernie and everyone from the ballot because they had decided Biden was going to get the nomination.

This conspiracy from Bernie bros is so deeply stupid.

The democratic coalition depends on black voters, and they decisively chose Joe Biden in South Carolina, sending a clear signal about who would have the strength to beat Trump (and in the end they were right).

It was not a party conspiracy.

Biden won pretty handedly because moderates didn't like that Bernie calls himself a socialist. If you're chronically online it might seem like Bernie was leading the pack but I've had many conversations with the older voting population that echo the sentiment that he was never their guy.

It’s not so crazy, Biden was more appealing to moderates.