The gay rights movement has always been pockmarked with "traitors" from within (Roy Cohn, anyone?), but the treachery always came from the right, not the left. That all changed a few days ago when Perez Hilton posted x-rated pics of Dustin Lance Black, a beloved, rising star in the movement. Black won the Oscar for Best Original Screenplay for Milk, Gus Van Zandt's ferociously moving bio-pic. He burst into the...