Dubya is not the only one who has trouble speaking. Just check out these gems from Rummy:
I don't know what the facts are but somebody's certainly going to sit down with him and find out what he knows that they may not know, and make sure he knows what they know that he may not know.
I believe what I said yesterday. I don't know what I said, but I know what I think, and, well, I assume it's what I said.
Well, um, you know, something's neither good nor bad but thinking makes it so, I suppose, as Shakespeare said.
It would be funny if it wasn't so appalling.