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You have provided lots of good insight backed up with links to reliable sources. Your analysis of Michele Bachmann is right on. Whenever I see her with that glazed look in her eyes I wonder if somehow she is under a self induced hypnotic trance. I believe she is sincere in her beliefs that everything she is doing is because her God has willed her to do it. You only need to look at the teachings of her Salem Evangelical Lutheran Church in Stillwater and her further indoctrination at Oral Roberts to make that correlation.
Francis Schaeffer's son, Frank, has written a book, Crazy for God, that exposes the extremism and hypocrisy of that kind of Christian fundamentalist thinking. It also offer insight into the minds of people like Michele Bachmann, and hey you can include Rick Santorum and a few others like that as well.
In trying to understand the political and religious motives of Michelle Bachmann I have reverted to reading books by psychologists...George Lakoff, Jonathan Haidt, Robert Altemeyer and Jesse Bering (the Belief Instinct) especially. However, even then it's hard to get a finger on her. The same could apply to Mitt Romney in a different sort of way. He's also got that "deer in a head light" type of stare when asked questions. Everything he says seems so out of touch with reality.
As you point out, however, some of these traits are not anywhere new. They go all the way back to Roman times and even earlier. Just how much is hereditary and how much environment is a challenge even for the scientists that delve into this stuff.
More perplexing is how so many of those Tea Party "think-a-likes" can all be elected to Congress at the same time.