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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Cantwell, Maria [D-WA] 07/06/2011
Sen. Begich, Mark [D-AK] 07/12/2011
Sen. Murray, Patty [D-WA] 03/29/2012
Sen. Merkley, Jeff [D-OR] 04/25/2012