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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Barrasso, John [R-WY]* 07/24/2013
Sen. Johnson, Tim [D-SD]* 07/24/2013
Sen. Tester, Jon [D-MT]* 07/24/2013
Sen. Udall, Tom [D-NM]* 07/24/2013
Sen. Franken, Al [D-MN]* 07/24/2013
Sen. Begich, Mark [D-AK]* 07/24/2013
Sen. Heitkamp, Heidi [D-ND]* 07/24/2013
Sen. Hirono, Mazie K. [D-HI]* 07/24/2013
Sen. Schatz, Brian [D-HI]* 07/24/2013
Sen. Heinrich, Martin [D-NM] 10/11/2013
Sen. Murkowski, Lisa [R-AK] 12/18/2013
Sen. Warren, Elizabeth [D-MA] 02/10/2014