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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Grassley, Chuck [R-IA]* 04/27/2010
Sen. Udall, Mark [D-CO] 04/29/2010
Sen. Inhofe, James M. [R-OK] 04/29/2010
Sen. Johanns, Mike [R-NE] 05/18/2010