This adds credibility to the rumors that the fake memos were a Bush campaign dirty trick. Push aside the story of the forged Niger documents with some forged Bush documents, then tarnish the credibility of 60 Minutes on exactly that issue -- detecting forged documents. So the Niger story can't run.

That's so tinfoil, but I can't help thinking it. It's like a spy comedy where you lie to fake out their expectations that you'll tell the truth to fake them out on their expectations that you'll lie, or something. It brings to mind the Nielsen Hayden slogan: "I deeply resent the way this administration makes me feel like a nutball conspiracy theorist." (here and here).