"Do tell, how do his efforts hurt the Administration's efforts in Iraq?"
Wow. Climb out of your spider hole and read the reports of his strategy. Clark's defense strategy it to attack the Iraqi invasion as illegal and unjustified. He'll lie, the media will drop to its collective needs and do a Lewinski, and useful idiots like you will repeat it as the Gospel, thereby giving him the necessary 20-30% of the population needed to continue the insurgency.
Your rudeness aside...
Clark's defense strategy is the business of himself, the rest of his legal team, and his client. A judge will make decisions on what is allowable in court. It's called due process of law. It's not always popular, but their is a reason why we're doing it instead of taking him out back and putting two in his head.