Each member listed as Supports sponsored or cosponsored a current bill, signed a discharge petition for one, or cosponsored a prior version of the reform in a past Congress and is still serving. Members not listed are Unknown: no documented signal yet, though they may still support or oppose. Floor votes aren't scored.

Several reforms have bills carried almost entirely by one party. That makes the headline percentage a measure of cosponsorship on these specific bills, not a measure of underlying agreement with the reform. A 0% figure for one party often means “has not cosponsored this vehicle,” not “opposes the reform.”

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