Rick,
Yeah, I suppose that some sort of illness is possible. But he has been completely re-vamped as a politician since his days as the Gov. If you take a good speech that he gives now, and take one of the good speeches that is shown in the video, there is a remarkable difference just in his style of delivery, but the message now sounds more folksy, less strident, and I think in a lot of ways more effective.
Whatever the case I'm a real skeptic with this kind of internet stuff anyway.