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* = Original cosponsor

CosponsorDate Cosponsored
Sen. Grassley, Chuck [R-IA]* 05/04/2011
Sen. Landrieu, Mary L. [D-LA] 05/09/2011
Sen. Coons, Christopher A. [D-DE] 11/10/2011
Sen. Kerry, John F. [D-MA] 11/26/2012