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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Crapo, Mike [R-ID]* 06/07/2012
Sen. Baucus, Max [D-MT] 06/11/2012
Sen. Enzi, Michael B. [R-WY] 06/12/2012
Sen. Tester, Jon [D-MT] 06/12/2012
Sen. Barrasso, John [R-WY] 06/13/2012
Sen. Udall, Mark [D-CO] 06/20/2012