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Democrats said they would accept it only as part of a broad deal and that the package being considered this weekend didn’t qualify.

Liberal interest groups, who had rallied their supporters to call congressional offices and oppose Chained CPI, cheered their win.

“Today’s victory shows that activism works,” said the Progressive Change Campaign Committee, which vowed to field primary challengers to run against any Democrat voting for the proposed policy.

Sean Lengell and David Sherfinski contributed to this report.