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* = Original cosponsor

Cosponsor Date Cosponsored
Sen. Cantwell, Maria [D-WA] 02/29/2012
Sen. Bennet, Michael F. [D-CO] 02/29/2012
Sen. Klobuchar, Amy [D-MN] 03/07/2012
Sen. Udall, Mark [D-CO] 03/07/2012