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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Carper, Thomas R. [D-DE]* 06/29/2011
Sen. Udall, Tom [D-NM]* 06/29/2011
Sen. Bennet, Michael F. [D-CO]* 06/29/2011
Sen. Whitehouse, Sheldon [D-RI] 07/25/2011