Sens. Bernie Sanders (Vt.) and Elizabeth Warren (Mass.) have been reluctant to go after each other when sharing the debate stage; in fact, they frequently end up agreeing with and supporting each other. The pair had a significant disagreement on Thursday night, though, when Warren swung a question about gun control around to announce her stance on the Senate filibuster.

"We have a Congress that's beholden to the gun industry," Warren said. "And unless we're willing to address that head on and roll back the filibuster, we're not going to get anything done on guns." Her campaign quickly took up the talking point on Twitter to reinforce it:

Nearly 90% of Americans want to see background checks. Why isn’t anything getting done? Because Congress is beholden to the NRA. It’s corruption, plain and simple. Unless we address systemic problems, like the filibuster and the gun lobby, we won’t get anywhere. #DemDebate — Elizabeth Warren (@ewarren) September 13, 2019 I want to be as clear as I can: When Democrats next have power, we should be bold. It’s time to get rid of the filibuster. #DemDebate — Elizabeth Warren (@ewarren) September 13, 2019

Sanders was asked afterward if he would support abolishing the filibuster as well. "No," the senator said bluntly. Sanders has said in the past that "Donald Trump supports the ending of the filibuster so you should be a little bit nervous if Donald Trump supports it," and argued that he has other ways to work the Senate rules.

But The New York Times' Astead Herndon observed that Warren coming out against the filibuster was strategic in that it "force[s] Bernie into a rare place of being an institutionalist." It seemed like people were listening, too; "filibuster" spiked 4,000 percent on Google during the debate. Jeva Lange