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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Landrieu, Mary L. [D-LA]* 03/28/2011
Sen. Brown, Scott P. [R-MA]* 03/28/2011
Sen. Merkley, Jeff [D-OR]* 03/28/2011
Sen. Enzi, Michael B. [R-WY]* 03/28/2011
Sen. Hagan, Kay [D-NC]* 03/28/2011
Sen. McCaskill, Claire [D-MO]* 03/28/2011
Sen. Grassley, Chuck [R-IA] 04/07/2011
Sen. Collins, Susan M. [R-ME] 04/14/2011