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* = Original cosponsor

CosponsorDate Cosponsored
Sen. Grassley, Chuck [R-IA]* 08/01/2013
Sen. Feinstein, Dianne [D-CA]* 08/01/2013
Sen. Harkin, Tom [D-IA]* 08/01/2013
Sen. Whitehouse, Sheldon [D-RI] 01/08/2014