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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Tester, Jon [D-MT]* 05/21/2013
Sen. Blumenthal, Richard [D-CT]* 05/21/2013
Sen. Begich, Mark [D-AK]* 05/21/2013
Sen. Heinrich, Martin [D-NM]* 05/21/2013
Sen. Boxer, Barbara [D-CA]* 05/21/2013
Sen. Whitehouse, Sheldon [D-RI] 05/23/2013
Sen. Baldwin, Tammy [D-WI] 06/06/2013