John Sides and Lynn Vavreck believe it will help Romney:
Romney is the second choice of a quarter of the electorate who did not rank him as a first choice. Nearly 40% of Gingrich voters list Romney as their second choice. More than half of Huntsman voters do so. This suggests that as the field narrows, Romney’s support will grow, in contrast to the notion that the “anti-Romney” vote could coalesce around another, apparently more conservative candidate if there weren’t so many conservatives in the race.
The Dish 