Last week, he introduced himself to 15 Republicans at Reading Public Library, 20 at ParkView Specialty Hospital in Springfield, and 12 assembled over slices at Caruso Pizza in Melrose. Thursday brought a welcome treat: 100 Republicans in a ballroom in Pittsfield, rapt and ready for his pitch. No crowd is too small, no event too far-flung for Kevin P. Scott, Wakefield Republican on a mission. The former selectman and member of the town Board of Public Works has been barnstorming the state hoping to be more David than Don Quixote. Despite the odds, he wants to unseat US Senator Edward...