“One word: Dementia”
I almost wish it were so, but it is not. Last election I observed Senator McCain closely for about an hour. He was sharp, knew what he was talking about, and at the top of his game.
The only reason that I can come up with is that he is a lifelong progressive.
The McCain family, including his direct ancestor, were slaveholders. He said he was unaware of this until his 2000 campaign.
http://en.wikipedia.org/wiki/Black_McCains