Senate Democrats hit the red button, the nuclear button. In one vote, they've changed an almost 40-year-old Senate rule.
By a 52-48 vote, the Senate ended the ability of minority Republicans to continue using filibusters to block some of President Barack Obama's judicial and executive nominations.
Republicans are on the warpath.
"This changes everything, this changes everything," veteran GOP Sen. John McCain of Arizona told reporters. He blamed newer Democratic senators who never served as the minority party for pushing the issue, adding: "They succeeded and they will pay a very, very heavy price for it."
Dana Bash is OutFront from Capitol Hill.