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FILE - This Oct. 2, 2012 file photo shows U.S. Sen. Jon Tester campaigning at the state Capitol in Helena, Mont. Tester is hanging on in a brutal re-election battle in Montana despite a drag from President Barack Obama, who is poised to lose big in this sparsely populated, libertarian-minded state. (AP Photo/Matt Gouras, File)

Associated Press
FILE - This Oct. 2, 2012 file photo shows U.S. Sen. Jon Tester campaigning at the state Capitol  in Helena, Mont. Tester is hanging on in a brutal re-election battle in Montana despite a drag from President Barack Obama, who is poised to lose big in this sparsely populated, libertarian-minded state.    (AP Photo/Matt Gouras, File)
FILE - This Oct. 2, 2012 file photo shows U.S. Sen. Jon Tester campaigning at the state Capitol in Helena, Mont. Tester is hanging on in a brutal re-election battle in Montana despite a drag from President Barack Obama, who is poised to lose big in this sparsely populated, libertarian-minded state. (AP Photo/Matt Gouras, File)
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