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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Udall, Tom [D-NM]* 06/20/2012
Sen. Udall, Mark [D-CO] 06/27/2012
Sen. Bennet, Michael F. [D-CO] 06/28/2012
Sen. Tester, Jon [D-MT] 06/28/2012