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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Dole, Elizabeth [R-NC]* 02/07/2008
Sen. Roberts, Pat [R-KS] 04/02/2008
Sen. Isakson, Johnny [R-GA] 06/26/2008
Sen. Hutchison, Kay Bailey [R-TX] 07/15/2008