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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Bingaman, Jeff [D-NM]* 06/04/2012
Sen. Udall, Mark [D-CO] 06/06/2012
Sen. Tester, Jon [D-MT] 06/06/2012
Sen. Feinstein, Dianne [D-CA] 06/06/2012