President Clinton took to the road to help Senator Ted Kennedy in the midst of the toughest campaign the Massachusetts Democrat has yet faced. As Clinton signed an education bill in Framingham, Massachusetts, he used the occasion to portray Kennedy, first elected in 1962, as an agent of change. "There is not a single, solitary member of the U.S. Senate more interested in new ideas than he is," Clinton told a roaring high school audience. Clinton's pat-on-the-back occurred as Kennedy's poll margin over businessman and G.O.P. candidate Mitt Romney grew to 10 points. A Boston Herald-WCVB-TV poll, conducted this week, showed 50% of the registered voters backing Kennedy and 40% behind Romney, with a margin of error of 4.9%. A month ago, a poll had them neck and neck.