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* = Original cosponsor
Cosponsor Date Cosponsored
Sen. Barrasso, John [R-WY]* 03/21/2013
Sen. Wyden, Ron [D-OR]* 03/21/2013
Sen. Tester, Jon [D-MT]* 03/21/2013
Sen. Bennet, Michael F. [D-CO]* 03/21/2013
Sen. Merkley, Jeff [D-OR] 03/22/2013
Sen. Udall, Tom [D-NM] 03/22/2013