By Jim EllisMarch 5, 2018 — A new Tarrance Group poll (Feb. 18-20; 500 likely North Dakota registered voters) conducted for the National Republican Senatorial Committee finds at-large Rep. Kevin Cramer (R-Bismarck) taking an early lead over first-term Sen. Heidi Heitkamp (D), 49-44 percent, a split just beyond the polling margin of error.
The Tarrance poll comes on the heels of previously released data from Gravis Marketing (Feb. 21-24; 385 North Dakota voters interviewed online) that gives Sen. Heitkamp a 43-40 percent edge, but this survey was conducted wholly online. Though the Tarrance poll was in the field before the Gravis study, the latter data was first to enter the public domain.
North Dakota state law prohibits vendors from placing automated telephone calls, which is Gravis’ usual method of conducting their surveys. Additionally, since the state has no voter registration requirement or system, the likely voter screen is a bit more difficult to define. Both of these elements would affect the reliability factor, and particularly so for the Gravis results.
The Tarrance data also detected a retrogression in Sen. Heitkamp’s favorability rating. Though still strong, her positive ratio is a net 10 points below what was determined in the organization’s October poll. The February data records the senator with a strong 54:38 percent positive to negative index, but that is below the 60:34 percent rating she received in October. Rep. Cramer posted a slightly better 53:29 percent positive ratio. He was not tested in the October poll.