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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Hutchison, Kay Bailey [R-TX]* 07/19/2007
Sen. Kerry, John F. [D-MA] 02/26/2008
Sen. Clinton, Hillary Rodham [D-NY] 02/28/2008
Sen. Obama, Barack [D-IL] 04/29/2008