EXETER, N.H. (AP) — Mitt Romney may be tightening his grip on New Hampshire voters, despite the best efforts of Texas Gov. Rick Perry.A new Suffolk University-7News poll shows the former Massachusetts governor leading Perry by 33 points among likely New Hampshire voters. Perry leads several recent national polls but finishes fourth in the nation's first primary state survey.Romney takes 41 percent. That's 27 points better than his nearest rival. Texas Rep. Ron Paul garners 14 percent with former Utah Gov. Jon Huntsman at 10 percent and Perry at 8 percent.It is the first nonpartisan poll focused on New Hampshire since Perry joined the race almost six weeks ago. Perry has visited New Hampshire several times and courted key officials.