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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Boxer, Barbara [D-CA]* 03/20/2007
Sen. Kerry, John F. [D-MA]* 03/20/2007
Sen. Cardin, Benjamin L. [D-MD]* 03/20/2007
Sen. Lautenberg, Frank R. [D-NJ]* 03/20/2007
Sen. Akaka, Daniel K. [D-HI] 04/10/2007
Sen. Lieberman, Joseph I. [ID-CT] 05/11/2007