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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Enzi, Michael B. [R-WY]* 06/06/2011
Sen. Barrasso, John [R-WY]* 06/06/2011
Sen. Merkley, Jeff [D-OR]* 06/06/2011
Sen. Cochran, Thad [R-MS] 07/29/2011