THE MEDIA COVERAGE of the killing of 24 Iraqis at Haditha has given rich new definition to the phrase "rush to judgment." The coverage, plus the reaction of antiwar politicians like Democratic representative John Murtha, amounts to a public verdict of guilty, rendered against a handful of Marines, before an investigation of the bloody incident is completed or a trial (if there is one) held. An egregious example was MSNBC host Chris Matthews's interview with Murtha on May 17. Asked to "draw us a picture of what happened in Haditha," the congressman said he'd tell "exactly" what occurred. "One Marine...