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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Feinstein, Dianne [D-CA]* 04/17/2012
Sen. Merkley, Jeff [D-OR]* 04/17/2012
Sen. Tester, Jon [D-MT]* 04/17/2012
Sen. Bennet, Michael F. [D-CO] 04/18/2012
Sen. Baucus, Max [D-MT] 04/18/2012
Sen. Brown, Sherrod [D-OH] 04/18/2012
Sen. Boxer, Barbara [D-CA] 04/18/2012
Sen. Sanders, Bernard [I-VT] 04/23/2012