SAN FRANCISCO - -- Mayor Gavin Newsom, attending Fleet Week festivities on the Marina Green today, lashed out at conservative critics who mocked San Francisco's consideration of a measure to ban the flight of the Navy's Blue Angels over the city during this week's celebration. He cited that criticism and reports that the city turned down a U.S. Marine request to make a television recruitment commercial in the Financial District as examples of what he called exploitation by conservatives who don't "allow the facts to get in their way. "Shame on the extreme right," Newsom told The Chronicle. "I am...