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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Udall, Mark [D-CO]* 02/07/2013
Sen. Johnson, Tim [D-SD] 02/25/2013
Sen. Begich, Mark [D-AK] 03/04/2013
Sen. Shaheen, Jeanne [D-NH] 03/13/2013