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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Kennedy, Edward M. [D-MA]* 03/28/2007
Sen. Enzi, Michael B. [R-WY]* 03/28/2007
Sen. Harkin, Tom [D-IA] 06/25/2007
Sen. Levin, Carl [D-MI] 12/18/2007