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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Dorgan, Byron L. [D-ND]* 05/01/2008
Sen. Levin, Carl [D-MI]* 05/01/2008
Sen. Casey, Robert P., Jr. [D-PA]* 05/01/2008
Sen. Sanders, Bernard [I-VT]* 05/01/2008