What did we learn in the debate? We asked four POLITICO campaign reporters — Christopher Cadelago, Holly Otterbein, Elena Schneider and Alex Thompson — for their takeaways from the Nevada debate.

Who had the best night? Who had the worst night?

Otterbein: Warren dominated the night. Progressive activists said this was the Warren they knew and loved and have missed recently this primary. The question is, is it too late for that to matter? It might not be: Amy Klobuchar’s strong debate performance before New Hampshire’s primary helped earn her an unexpected third-place finish there.

Meanwhile, Bloomberg had a devastating night, and post-debate polls will show whether his support is as soft as his rivals believe it is. Many voters likely learned for the first time tonight that he endorsed former President George W. Bush for reelection, made offensive comments about women, used nondisclosure agreements to keep allegations of sexual harassment at his company quiet, and on and on.

Thompson: Warren clearly had a good night — but I think Sanders probably had the best night, given that he went on stage as the frontrunner and seemed to leave the stage as the frontrunner. Other rivals, realizing he is on a path to winning the nomination, lobbed more attacks than ever, but Sanders largely deflected them.

As for the worst night, Bloomberg learned that running for president is harder than it looks. The other candidates have been campaigning for the better part of a year and had participated in eight other debates before. Bloomberg hadn’t — and it showed. He did seem to get more comfortable after the first hour, so perhaps the next debate will be better.

Cadelago: Warren brought the fight and showed that she isn’t ready to go down quietly. Her almost prosecutorial exchanges with Bloomberg over his wealth and his company’s nondisclosure agreements with women will be replayed in debate highlights for years. Warren’s challenge will be how to carry forward her momentum and stay in the hunt until Super Tuesday — essentially, avoid being this year’s Chris Christie, whose big debate performance in 2016 is remembered for bringing down Marco Rubio more than it boosted him. Warren will have to coalesce some voters that are gravitating to Sanders.

As for Bloomberg, he’ll have to hope that what happened in Vegas stays in Vegas.

Schneider: Heartily agree with Chris here. Warren took on nearly every person on that stage, and she displayed the fight she’s talked about on the stump — but held in reserve, up until now, against her fellow Democrats.

But strikingly, though, Warren barely took direct aim at Sanders, who is the Democratic frontrunner in Nevada as well as the latest national polls.