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* = Original cosponsor

CosponsorDate Cosponsored
Sen. Tester, Jon [D-MT]* 06/19/2012
Sen. Begich, Mark [D-AK] 06/20/2012
Sen. Sanders, Bernard [I-VT] 06/26/2012
Sen. Mikulski, Barbara A. [D-MD] 07/25/2012