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* = Original cosponsor
CosponsorDate Cosponsored
Sen. McCain, John [R-AZ]* 01/31/2012
Sen. Coburn, Tom [R-OK]* 01/31/2012
Sen. Enzi, Michael B. [R-WY]* 01/31/2012
Sen. Udall, Mark [D-CO] 11/30/2012