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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Inhofe, James M. [R-OK]* 04/22/2009
Sen. Boxer, Barbara [D-CA]* 04/22/2009
Sen. Kerry, John F. [D-MA]* 04/22/2009
Sen. Collins, Susan M. [R-ME] 05/06/2009
Sen. Voinovich, George V. [R-OH] 06/22/2009
Sen. Merkley, Jeff [D-OR] 06/22/2009
Sen. Klobuchar, Amy [D-MN] 06/22/2009
Sen. Franken, Al [D-MN] 07/23/2009