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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Lautenberg, Frank R. [D-NJ] 02/29/2008
Sen. Harkin, Tom [D-IA] 02/29/2008
Sen. Grassley, Chuck [R-IA] 02/29/2008
Sen. Casey, Robert P., Jr. [D-PA] 02/29/2008