The party's rally around Biden post-South Carolina, his wins on Super Tuesday and the wave of endorsements in the days since combined to make it really, really hard for Sanders. I anticipated that Sanders was going to struggle to win many states after Super Tuesday, and tonight suggests that is correct. The big question is now is where do Sanders and the party establishment go? The party people want him to quit as soon as possible. Sanders has more strength if he runs for a while, accumulates more delegates and argues that, at 30 to 35 percent support nationally, he speaks for one-third of the party. But it's hard to keep your supporters going and the media covering you extensively if everyone assumes you are losing.