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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Udall, Mark [D-CO]* 05/22/2013
Sen. Bennet, Michael F. [D-CO]* 05/22/2013
Sen. Crapo, Mike [R-ID]* 05/22/2013
Sen. Heinrich, Martin [D-NM]* 05/22/2013
Sen. Risch, James E. [R-ID] 05/23/2013