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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Harkin, Tom [D-IA] 11/28/2012
Sen. Mikulski, Barbara A. [D-MD] 11/28/2012
Sen. Franken, Al [D-MN] 11/28/2012
Sen. Rockefeller, John D., IV [D-WV] 11/29/2012