Amy Walter:

I know. We really are with Biden in the lead of delegates.

In fact, Lisa, I was just walking through our conversation in my head the other day when you said, well, what would it take for Joe Biden to be able to catch up?

And I said, well, you know, part of Joe Biden's problem is, he doesn't have a lot of money or infrastructure. And that actually didn't matter much, because what he had was unity. And he had Donald Trump.

And Donald Trump is the best get-out-the-vote operation that Democrats have had. It helped them in the 2017 legislative races. It helped them in the 2018 races for Congress in the midterms. And it's helping Joe Biden now, because Democratic voters are so focused — we have been talking about this, Lisa — from the very beginning of this contest, the intense focus that Democrats, the majority of Democrats have, on beating Donald Trump, how important that is to them.

And when every — almost every other Democrat dropped out, Pete Buttigieg, Amy Klobuchar, and Beto O'Rourke all came together right before Super Tuesday and endorsed Joe Biden, what it said to Democratic voters was, OK, this is the candidate who can beat Donald Trump.

And it paid off, obviously, quite substantially on Super Tuesday. So where we are right now, Lisa, is, we're looking at Joe Biden going from underdog to front-runner, and now it's Bernie Sanders who's the underdog.

He is going to need the kind of muscular turnout and vote share that Joe Biden had in Super Tuesday for this upcoming Super Tuesday.