NEW YORK - Madison Avenue had unwelcome news for John Kerry's campaign yesterday as advertising executives said Bruce Springsteen, who is campaigning with the Democratic presidential hopeful, turns away more votes than he attracts. The campaign trails have begun to look like Hollywood Boulevard as both presidential candidates inject star power into their campaigns, with Terminator star Arnold Schwarzenegger appearing with George W. Bush in Columbus, Ohio, yesterday. While many stars have spoken out about their presidential preference, with most opting for Mr. Kerry, a major ad industry study shows most voters prefer candidates who keep their distance from Hollywood....