It went as I predicted. If Sanders were a conventional politician, he would see that he has no path to the nomination, and drop out. Unfortunately, he is the leader of a movement of sorts, so quitting isn’t that simple.
Unlike too many of his followers, Sanders agrees that defeating Trump has to be an overriding objective. The only way to keep the movement going without damaging Biden’s chances of winning in November is to change the focus of the campaign; in other words, he needs to stop disparaging Biden, and limit himself to positive talk about his agenda and uniting the nation to oust the man on golf cart.