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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Harkin, Tom [D-IA]* 11/10/2011
Sen. Enzi, Michael B. [R-WY]* 11/10/2011
Sen. Casey, Robert P., Jr. [D-PA]* 11/10/2011
Sen. Mikulski, Barbara A. [D-MD]* 11/10/2011
Sen. Alexander, Lamar [R-TN]* 11/10/2011
Sen. Lieberman, Joseph I. [ID-CT]* 11/10/2011
Sen. Collins, Susan M. [R-ME]* 11/10/2011
Sen. Hagan, Kay [D-NC]* 11/10/2011
Sen. Roberts, Pat [R-KS]* 11/10/2011
Sen. Bennet, Michael F. [D-CO] 12/05/2011
Sen. Blumenthal, Richard [D-CT] 03/13/2012