Bernie Sanders beat establishment favorite Hillary Clinton by more than 20 points in 2016. On Tuesday, he won the state by a much narrower margin. Considering that he’s running against more than half a dozen contenders this year, perhaps that’s only natural. But Sanders has to be looking over his shoulder right now.

Thanks to Joe Biden’s collapse in the Iowa caucuses and in national polling, especially among critical black voters, the septuagenarian socialist headed into the primary with all of the momentum behind him. He routinely led the Democratic field in polling, and his exemplary ground game enabled him to knock on the doors of nearly one-quarter of New Hampshire’s 640,000 households just on the day before the primary.