FILE - In this Sept. 5, 2012 file photo North Dakota Republican Senate candidate Rep. Rick Berg, R-N.D. speaks in Bismarck, N.D. What does a pair of Senate candidates do when their state is booming amid a sluggish national economy? They focus on personal style. That's the case in North Dakota, where Democrat Heidi Heitkamp and Republican congressman Rick Berg are waging a surprisingly tight race for an open Senate 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. What does a pair of Senate candidates do when their state is booming amid a sluggish national economy? They focus on personal style. That's the case in North Dakota, where Democrat Heidi Heitkamp and Republican congressman Rick Berg are waging a surprisingly tight race for an open Senate 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. What does a pair of Senate candidates do when their state is booming amid a sluggish national economy? They focus on personal style. That's the case in North Dakota, where Democrat Heidi Heitkamp and Republican congressman Rick Berg are waging a surprisingly tight race for an open Senate seat. (AP Photo/Dale Wetzel, File)
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