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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Klobuchar, Amy [D-MN]* 05/01/2008
Sen. Tester, Jon [D-MT]* 05/01/2008
Sen. Harkin, Tom [D-IA]* 05/01/2008
Sen. Kerry, John F. [D-MA] 05/20/2008