A new Gray TV poll in North Dakota finds Kevin Cramer (R) leads Sen. Heidi Heitkamp (D) by 16 percentage points, 56% to 40%, increasing his lead since a September poll which gave Cramer a 10-point advantage. Key finding: “Heitkamp’s support appears relatively fixed. Only 5% of those supporting her say that they might change their mind, compared to 17% of Cramer supporters who say they may still change theirs.”