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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Lieberman, Joseph I. [ID-CT]* 06/30/2011
Sen. Carper, Thomas R. [D-DE] 09/19/2011
Sen. Coons, Christopher A. [D-DE] 10/04/2011
Sen. Casey, Robert P., Jr. [D-PA] 02/09/2012