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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Bunning, Jim [R-KY]* 03/15/2007
Sen. Bingaman, Jeff [D-NM]* 03/15/2007
Sen. Salazar, Ken [D-CO]* 03/15/2007
Sen. Tester, Jon [D-MT] 06/27/2008