NASHUA, N.H. — Scott Brown attracted more than 125 pro-gun conservatives to a GOP holiday party here Thursday night — but they came to protest his appearance, not to hear him speak. The spectacle — protesters outnumbered activists who coughed up $50 to see Brown — was a stark illustration of the treacherous political terrain facing the 54-year-old New Hampshire transplant if he launches a Senate bid that’s looking more likely by the day."