FILE - In this Sept. 5, 2012 file photo North Dakota Republican Senate candidate Rep. Rick Berg, R-N.D. speaks in Bismarck, N.D. Senate Democrats are launching two ads in North Dakota criticizing Berg over the stalled farm bill. Berg is locked in a close race with Democrat Heidi Heitkamp for the open seat. (AP Photo/Dale Wetzel, File)

Associated Press
FILE - In this Sept. 5, 2012 file photo North Dakota Republican Senate candidate Rep. Rick Berg, R-N.D. speaks in Bismarck, N.D. Senate Democrats are launching two ads in North Dakota criticizing Berg over the stalled farm bill. Berg is locked in a close race with Democrat Heidi Heitkamp for the open seat.  (AP Photo/Dale Wetzel, File)
FILE - In this Sept. 5, 2012 file photo North Dakota Republican Senate candidate Rep. Rick Berg, R-N.D. speaks in Bismarck, N.D. Senate Democrats are launching two ads in North Dakota criticizing Berg over the stalled farm bill. Berg is locked in a close race with Democrat Heidi Heitkamp for the open seat. (AP Photo/Dale Wetzel, File)
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