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* = Original cosponsor

CosponsorDate Cosponsored
Sen. Lieberman, Joseph I. [ID-CT]* 02/08/2011
Sen. Collins, Susan M. [R-ME]* 02/08/2011
Sen. Tester, Jon [D-MT] 03/17/2011
Sen. Carper, Thomas R. [D-DE] 05/11/2011