PORTSMOUTH — A verbal altercation Friday night at Portsmouth High School came about because of an idling tour bus belonging to Republican U.S. Senate candidate Scott Brown. ...Williams (a spokesperson for the Brown campaign) said a man approached the bus, screaming obscenities. He said the man, later identified as New Castle resident Burt Cohen, a longtime Democratic state senator, not only refused to leave when asked, but attempted to board the bus, accosting a campaign volunteer who tried to stop him. Williams alleges that the volunteer campaign worker stood between Cohen and the bus and Cohen "physically assaulted" the campaigner...