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* = Original cosponsor

CosponsorDate Cosponsored
Sen. Grassley, Chuck [R-IA]* 02/14/2013
Sen. Franken, Al [D-MN]* 02/14/2013
Sen. Harkin, Tom [D-IA]* 02/14/2013
Sen. Casey, Robert P., Jr. [D-PA]* 02/14/2013
Sen. Inhofe, James M. [R-OK]* 02/14/2013
Sen. Levin, Carl [D-MI]* 02/14/2013
Sen. Murkowski, Lisa [R-AK] 02/26/2013
Sen. Blunt, Roy [R-MO] 03/20/2013