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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Udall, Mark [D-CO]* 05/20/2013
Sen. Heller, Dean [R-NV]* 05/20/2013
Sen. Johnson, Tim [D-SD]* 05/20/2013
Sen. Flake, Jeff [R-AZ] 05/21/2013