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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Tester, Jon [D-MT]* 03/14/2013
Sen. Begich, Mark [D-AK]* 03/14/2013
Sen. Wyden, Ron [D-OR]* 03/14/2013
Sen. Hoeven, John [R-ND] 03/18/2013
Sen. Grassley, Chuck [R-IA] 03/18/2013
Sen. Landrieu, Mary L. [D-LA] 03/18/2013