The government considers Zacarias Moussaoui a fitting candidate for execution. He is an admitted terrorist who pleaded guilty last year to being part of the Al Qaeda plot that led to the Sept. 11, 2001, hijackings. He was jailed on unrelated charges weeks before the attacks, but prosecutors contend he could have blown the whistle and prevented the carnage. A government attorney assisting the prosecution team has now done serious damage to the government's case at Moussaoui's ongoing death-penalty trial. Carla Martin, a lawyer for the Transportation Security Administration, allegedly violated a direct court order by coaching prospective prosecution witnesses...