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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Bingaman, Jeff [D-NM]* 03/12/2008
Sen. Johnson, Tim [D-SD]* 03/12/2008
Sen. Feingold, Russell D. [D-WI]* 03/12/2008
Sen. Stevens, Ted [R-AK] 03/13/2008