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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Grassley, Chuck [R-IA]* 03/29/2007
Sen. Obama, Barack [D-IL]* 03/29/2007
Sen. Dole, Elizabeth [R-NC]* 03/29/2007
Sen. McCain, John [R-AZ] 04/17/2008