Sen. Kelly Ayotte (R-N.H.)

WARREN, N.H. – The fight of over gun control moved into the White Mountains of New Hampshire on Tuesday as groups pushing for stricter gun laws confronted Sen. Kelly Ayotte (R-N.H.) on her decision to vote against a bipartisan plan to expand the national gun background check system.

Ayotte is the only senator from the Northeast to stand against the background check bill, making her a prime target for gun control groups that plan to follow her this week across the state to several public events. They're buoyed by new polling that suggests Ayotte's popularity is slipping here because of her vote.

During a town hall meeting in this tiny mountainside village, Ayotte stuck to a pre-determined format that included a lengthy PowerPoint presentation of her positions on gun control, sequestration, the federal deficit and implementation of the health-care reform law. Then she asked a moderator to call on members of the audience who had submitted prewritten questions.