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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Udall, Mark [D-CO]* 08/02/2011
Sen. Bennet, Michael F. [D-CO]* 08/02/2011
Sen. Franken, Al [D-MN]* 08/02/2011
Sen. Conrad, Kent [D-ND] 12/15/2011
Sen. Brown, Sherrod [D-OH] 03/05/2012
Sen. Grassley, Chuck [R-IA] 05/15/2012