Associated Press
FILE - In this May 16, 2012 file photo, Nebraska state Sen. Deb Fischer speaks in Lincoln, Neb. It's encouraging news for Democrats: Divisive Republican primaries, a surprise GOP retirement in Maine and an unexpectedly strong Democratic challenger in North Dakota are making the battle for Senate control increasingly difficult to predict. Nearly half of all races appear competitive, an unusually high number. (AP Photo/Nati Harnik, File)

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