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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Boxer, Barbara [D-CA]* 03/13/2008
Sen. McCain, John [R-AZ]* 03/13/2008
Sen. Kyl, Jon [R-AZ] 03/31/2008
Sen. Specter, Arlen [R-PA] 04/22/2008
Sen. Coburn, Tom [R-OK] 05/02/2008