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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Johnson, Tim [D-SD]* 06/09/2011
Sen. Brown, Sherrod [D-OH] 11/09/2011
Sen. Gillibrand, Kirsten E. [D-NY] 01/26/2012
Sen. Enzi, Michael B. [R-WY] 02/16/2012