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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Dorgan, Byron L. [D-ND]* 03/28/2007
Sen. Grassley, Chuck [R-IA]* 03/28/2007
Sen. Thomas, Craig [R-WY]* 03/28/2007
Sen. Conrad, Kent [D-ND]* 03/28/2007
Sen. Johnson, Tim [D-SD] 04/10/2007
Sen. Tester, Jon [D-MT] 04/20/2007