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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Cowan, William M. [D-MA]* 05/20/2013
Sen. Durbin, Richard [D-IL] 05/21/2013
Sen. Lautenberg, Frank R. [D-NJ] 05/22/2013
Sen. Kirk, Mark Steven [R-IL] 05/22/2013