Here's the NPR interview with Richard Clark:
http://www.npr.org/templates/story/s...toryId=4973952
I think the specific comments are about 10 minutes into it, but the whole first part of the interview is about the Plame case. He makes several very good points, in my opinion. The key being that when it comes to such investigations we only have one tool and therefore everything looks like a hammer. He suggests there needs to be some kind of investigative process that isn't inherently about criminal investigation (like the Truth Commissions in South Africa) that simply produce findings of fact. Those can then be used for criminal persuits if judged appropriate.