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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Coons, Christopher A. [D-DE]* 05/10/2011
Sen. Whitehouse, Sheldon [D-RI]* 05/10/2011
Sen. Merkley, Jeff [D-OR] 04/18/2012
Sen. Rockefeller, John D., IV [D-WV] 05/09/2012
Sen. Johnson, Tim [D-SD] 06/26/2012