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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Udall, Tom [D-NM]* 01/29/2013
Sen. Durbin, Richard [D-IL]* 01/29/2013
Sen. Blumenthal, Richard [D-CT]* 01/29/2013
Sen. Harkin, Tom [D-IA] 02/27/2013
Sen. Warren, Elizabeth [D-MA] 03/04/2013