The Democratic race is as fluid as it looks. No one, even bright party professionals speaking off the record, knows what to expect. Biden was inevitable, then maybe Elizabeth, maybe Pete’s inevitable, but Bernie may be inevitable, and don’t write off Joe.

But “Beat Trump” is back. When 2019 began Democrats were thinking that was priority No. 1. Then other things became more important—Medicare for All, climate change, policy. But it feels like Democrats here are circling back to their original desire. “Who can beat Trump?” is again the most important question. They don’t know the answer. They’re trying to figure it out.

You can hear this in what the candidates say.

At a Teamsters forum in Cedar Rapids Saturday, Sen. Bernie Sanders was burly in his aggression. “This is a president who is a fraud,” “a pathological liar,” “a homophobe,” “a bigot.” Mr. Sanders said his campaign is about “telling the billionaire class that their greed is unacceptable.” He got a standing ovation.