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Associated Press
FILE - In this Dec. 7,2011 file photo, former Virginia Govs Tim Kaine, left, and George Allen, a former senator, greet each other in Richmond, Va,  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/Steve Helber, File)

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