All one needs for confirmation is to hear President Bush speak in a natural setting, off the cuff with no prepared remarks. He is amazing to listen to with his knowledge and free flow of ideas. It is reading/reciting a prepared speech that throws him. One of the reasons he hates telepromters, IIRC.
From what I've heard that may not be true. I believe it's his brother that has it. Also I don't believe you can be a pilot and have this disorder.