Ya know when you are watching a movie in which a fictitious President is a character? "Armageddon," "Wag the Dog," "24" etc. You know how they don't always seem quite right? I think it is because, while you can believe other actors as the fictitious characters you have never met, you try to image electing that actor as your President and you just can't picture him/her in the role.
I feel the same way about John McCaine. To me, he feels like an actor playing the President in some 80's movie starring either Matthew Broderick or Marc Singer.
Can you tell the difference?