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* = Original cosponsor

Cosponsor Date Cosponsored
Sen. Kirk, Mark Steven [R-IL]* 07/14/2011
Sen. McCaskill, Claire [D-MO] 07/18/2011
Sen. Collins, Susan M. [R-ME] 07/19/2011
Sen. Warner, Mark R. [D-VA] 07/20/2011