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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Voinovich, George V. [R-OH] 07/20/2006
Sen. Grassley, Chuck [R-IA] 07/20/2006
Sen. Bunning, Jim [R-KY] 07/20/2006
Sen. Harkin, Tom [D-IA] 09/07/2006