Rob BlackRob Black -- the preferred District 6 candidate of Mayor Gavin Newsom who was pipped at the post by Chris Daly in the 2006 supervisorial race -- told SF Weekly he has no plans to run again. In fact, if things go his way, he won't even be living in the district much longer. "My wife and I are looking for a house and odds are we aren't going to be able to buy one in District 6," says Black, the vice president for public policy at the San Francisco Chamber of Commerce. "We've been renters