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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Klobuchar, Amy [D-MN]* 07/23/2013
Sen. Rockefeller, John D., IV [D-WV]* 07/23/2013
Sen. Baldwin, Tammy [D-WI] 06/09/2014
Sen. Donnelly, Joe [D-IN] 06/16/2014