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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Roberts, Pat [R-KS]* 02/14/2012
Sen. Nelson, Ben [D-NE] 02/15/2012
Sen. McCaskill, Claire [D-MO] 03/01/2012
Sen. Johanns, Mike [R-NE] 03/08/2012
Sen. Lugar, Richard G. [R-IN] 03/13/2012