FILE - This combination of file photos shows the candidates for the U.S. Senate from North Dakota from left, incumbent Democratic Sen. Heidi Heitkamp and her Republican challenger Kevin Cramer. Heitkamp is sharpening her attacks on Cramer on the tariffs issue, with a new ad out Friday, Sept. 14, 2018, that blames her opponent for not opposing tariffs that Heitkamp says are badly damaging North Dakota farmers. (AP Photo/File)
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