The Chicago Tribune spilled the beans here. They clammed up for almost eight months, then let go with the FBI- wire story. The cops had to move fast, just to beat the shredders. If anyone's protecting BO, it's the paper. Just for the record.
I thought the Trib was sitting on the story for Fitz. I don't rule out the fear of the paper blowing Fitz's cover may have been the reason for the pre-crime arrest and yet the Scooter Libby/Plume/Armitage thing has left me with a suspicious mind when it comes to Fitz's motives.