First he leaves At the Movies; now, he's no longer the U.S. Attorney for the Northern District of Texas. As of tomorrow, Richard Roper's back in the private sector, working for Thompson & Knight, after four years spent as U.S. Attorney. Course, this was inevitable: Barack Obama will pick a new person for the job, and Roper, a President Bush appointee and a federal prosecutor for 21 years, figured it was better to jump now than get pushed later. Still, as recounted in the media release after