“Everything stays on the table. You keep it all on the table. Don’t take anything off the table,” Sen. Elizabeth Warren (D-Mass.) said when asked about the fate of the filibuster. “That’s a clear answer. You’re not going to have a clearer answer than that.”

Countered Sen. Cory Booker (D-N.J.), another likely presidential contender: “We should not be doing anything to mess with the strength of the filibuster. It’s one of the distinguishing factors of this body. And I think it is good to have the power of the filibuster.”

Democrats hold 47 Senate seats now and have a realistic shot at winning the majority back in 2020, but absolutely no prospect of getting a filibuster-proof 60 seats anytime soon. There are other ways around the 60-vote threshold, but they come with their own drawbacks, leaving the “nuclear option” of unilaterally killing the filibuster as perhaps the only way to advance major progressive changes the next time Democrats have unified control of Washington.