Here's an interesting bit of polling. According to Gallup, Republicans rate their mental health as excellent at much higher rates than the rest of us. Now some might claim than members of the GOP are more sane than the rest of us. But its important to note that this poll only asks people to rate their own mental health, its not a mental health evaluation. So Republicans think that they are sane. They are not sane. I refer you to this quote from Lost:
Jack: I think I'm going crazy.
Locke: Oh, you're not going crazy.
Locke: No, crazy people don't know they're going crazy, they think they're getting saner.
I miss Lost.