Last week he was called “fair” and “just.” Today, Judge John Roll, the federal judge killed in the Tucson shooting, is being called a hero. Police say security footage from the Safeway store where the shooting occurred shows accused gunman Jared Loughner walking up to Rep. Gabrielle Giffords and shooting here at close range — the video shows only a wisp of her hair, however. Loughner then turns and begins firing indiscriminately into the crowd. “He wheels this direction and that direction firing,” Chris Nanos, a captain with the Pima County Sheriff’s Department who has viewed the video, told the...