Former second lady Tipper Gore is urging her husband, Al, to challenge Hillary Clinton for the 2008 presidential nomination - in what may be a score-settling move against the woman Mrs. Gore has long regarded as "difficult" and overly ambitious. "If he were going to run in the future, of course I would support him," Mrs. Gore told ABC News' Claire Shipman on Tuesday. "I think he'd be a fantastic president. He already got a majority of votes of people in this country once, and so that says something." Relations between Mrs. Gore and the first lady-turned-presidential front-runner have never...