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* = Original cosponsor

CosponsorDate Cosponsored
Sen. Risch, James E. [R-ID]* 11/01/2011
Sen. Reid, Harry [D-NV]* 11/01/2011
Sen. Udall, Mark [D-CO]* 11/01/2011
Sen. Heller, Dean [R-NV]* 11/01/2011
Sen. Bennet, Michael F. [D-CO] 06/11/2012
Sen. Udall, Tom [D-NM] 08/02/2012