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 c

 

              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 c
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)