Transcript for Biggest moments of the 2020 Democratic debate
Ilhan OMAR as well. Let's get analysis from Jon Karl. We did see a brand-new dynamic. All those attacks on Elizabeth Warren. You saw both mayor Pete and senator klobuchar trying to crowd into Joe Biden's centrist space. Reporter: When you are the front-runner, you get hit hard. We saw in the previous debate it was Biden that took August the hits. This time it was clearly Elizabeth Warren and you saw Amy klobuchar and mayor Pete buttigieg kind of gang up on her one-two punch and not go after Biden almost as if they were waiting or expecting Biden to fade in this race and they want to pick up the space he has occupied. Warren also, George, I have to say looked a little evasive in her answers, but when you are the front-runner, you take the hits. You definitely do take the hits and one thing we've seen not only is Elizabeth Warren rising in the polls but Joe Biden in these new fund-raising numbers that came out, he has far less money on hand than Warren an others. Reporter: This is remarkable. The cash on hand. This is what you need to run your campaign. Biden has about a third of what mayor buttigieg has in terms of cash on hand. A fourth of what Bernie Sanders has. He is number five overall in terms of the money to run the race. Jon, the other way it was different, far more focus on president trump than you had seen in the earlier debates where Democrats were more focused on each other. Reporter: Particularly in our debate in Houston you went long periods of time with no mention whatsoever of Donald Trump, the candidates wanted to focus on what they would do and attack their rivals in this race. Can you no longer ignore Donald Trump, the impeachment inquiry is center here and trump was very much front and center in this debate. Okay, Jon Karl, thanks very much.
This transcript has been automatically generated and may not be 100% accurate.