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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Collins, Susan M. [R-ME]* 07/22/2011
Sen. Lieberman, Joseph I. [ID-CT]* 07/22/2011
Sen. Brown, Scott P. [R-MA]* 07/22/2011
Sen. Casey, Robert P., Jr. [D-PA] 03/12/2012