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* = Original cosponsor
CosponsorDate Cosponsored
Sen. Nelson, Ben [D-NE]* 05/25/2011
Sen. Murkowski, Lisa [R-AK]* 05/25/2011
Sen. Risch, James E. [R-ID]* 05/25/2011
Sen. Enzi, Michael B. [R-WY] 06/09/2011