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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Grassley, Chuck [R-IA]* 03/21/2013
Sen. Manchin, Joe, III [D-WV]* 03/21/2013
Sen. McCaskill, Claire [D-MO]* 03/21/2013
Sen. Tester, Jon [D-MT]* 03/21/2013