Lamontagne's image ratings are more mixed. Thirty-six percent of likely voters have a favorable opinion of him, up from 30 percent in August. But a third view him unfavorably, more than the 20 percent who had an unfavorable opinion of him in the previous poll. That previous poll showed Lamontagne with an insignificant advantage on the ballot test, 33 percent to 31 percent, with 35 percent undecided. The poll of 600 likely voters was conducted Sept. 27-30 by the University of New Hampshire Survey Center.