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* = Original cosponsor

Cosponsor Date Cosponsored
Sen. Casey, Robert P., Jr. [D-PA]* 05/23/2013
Sen. Cowan, William M. [D-MA]* 05/23/2013
Sen. Gillibrand, Kirsten E. [D-NY]* 05/23/2013
Sen. Harkin, Tom [D-IA]* 05/23/2013
Sen. Heinrich, Martin [D-NM]* 05/23/2013
Sen. Reed, Jack [D-RI]* 05/23/2013
Sen. Schatz, Brian [D-HI]* 05/23/2013
Sen. Tester, Jon [D-MT]* 05/23/2013
Sen. Udall, Tom [D-NM]* 05/23/2013
Sen. Whitehouse, Sheldon [D-RI]* 05/23/2013
Sen. Wyden, Ron [D-OR]* 05/23/2013
Sen. Mikulski, Barbara A. [D-MD] 06/04/2013
Sen. Baldwin, Tammy [D-WI] 06/04/2013
Sen. Warren, Elizabeth [D-MA] 06/10/2013