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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Akaka, Daniel K. [D-HI]* 03/31/2011
Sen. Thune, John [R-SD]* 03/31/2011
Sen. Johnson, Tim [D-SD]* 03/31/2011
Sen. Tester, Jon [D-MT]* 03/31/2011
Sen. Udall, Tom [D-NM]* 03/31/2011
Sen. Enzi, Michael B. [R-WY] 06/06/2011
Sen. Bingaman, Jeff [D-NM] 06/25/2012
Sen. Cantwell, Maria [D-WA] 07/16/2012