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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Grassley, Chuck [R-IA]* 06/23/2011
Sen. Klobuchar, Amy [D-MN]* 06/23/2011
Sen. Blunt, Roy [R-MO]* 06/23/2011
Sen. Harkin, Tom [D-IA]* 06/23/2011
Sen. Murray, Patty [D-WA]* 06/23/2011
Sen. Franken, Al [D-MN]* 06/23/2011
Sen. Johnson, Tim [D-SD] 11/15/2011
Sen. Thune, John [R-SD] 11/18/2011
Sen. Shaheen, Jeanne [D-NH] 01/31/2012