Kevin Drum over at Mother Jones is basically saying it’s lights our for Bernie:

Did Bernie really lose 30 points of support in the past two weeks? That’s what the polls seem to show. But why? And how did the press not pick up on this? Most of the coverage I’ve seen has suggested that, sure, Hillary is going to win, but she’s really being pressed in the black community and Bernie could do better than expected. But according to the exit polls, she ended up winning 84 percent of the black vote. And perhaps even more worryingly for Bernie, she even crushed him among voters who agree that our economic system favors the wealthy. That’s his wheelhouse, and he won only 30 percent of their vote.

We’ll know more after Tuesday, but this doesn’t look good for Sanders. If Hillary racks up a big win on Super Tuesday, she’ll be so far ahead in the delegate count she’ll be almost mathematically unbeatable. At that point, it will be pretty hard for him to justify staying in the race.