Bear in mind, NH did give Kelly Ayotte 60% in 2010... It's not inconceivable for Romney to be ahead here given this is one of many of his "home states."
But this is ARG. Didn't they somehow have a great season in 2010?
After Super Tuesday 2008, their poll numbers went from downright insane to somewhat close to the consensus of other pollsters overnight. I don't think they've really gotten any better. They just started making numbers up that don't look as bad. I mean, the head of their polling company has demonstrated that he doesn't actually understand the most basic concepts of polling:
http://www.fivethirtyeight.com/2010/07/arg-my-brain-hurts.html