http://www.huffingtonpost.com/michael-melcher/hillary-clinton-misunder_b_76282.htmlSince 75% of the population is extraverted, extraverts are considered normal. By comparison, introverts are considered a little weird ("why can't you just open up?"). (As I've written in The Creative Lawyer, law is an exception: the majority of lawyers are introverts.) Introverts often have to feign extraversion to succeed in the professional world; their natural style is often not valued. Much of the criticism of Hillary Clinton's authenticity is criticism of her introversion. She's basically criticized for being private and for being careful about her words; and then she's criticized for inauthenticity when she tries to act more extraverted and social.
The second Myers-Briggs function is intuition vs. sensing. Intuitives look for concepts, the big picture, and possibilities. Sensing types are more interested in facts, details and concrete reality. Hillary has some strong sensing skills but my guess that she, like Bill, is an intuitive abbreviated as "N").
The third Myers-Briggs function is thinking vs. feelings. Both of these are ways of thinking. Thinkers prefer to make decisions based on impartial, objective principles, whereas feelers prefer to make decisions based on strongly held personal values or the effect on other people. Thinkers tend to think logically; feelers tend to think associatively. Though Hillary talks a lot about her values, I think that she, like the vast majority of lawyers and virtually all the men running for president (with the possible exception of John Edwards), is a thinker. Bill is a feeler.
Around 60% of women are feelers, and around 60% of men are thinkers. This means that both Hillary and Bill are in the minority for their particular gender. This is where the press gets wigged out. The words commonly used to describe presidential presence are all thinker-ish: strong, clear-headed, tough, questioning, blah blah blah. So the press is constantly evaluating whether she's enough of a thinker to be president. At the same time, the press seems discomfited that Hillary is not more girly: they also want her to be compassionate, open, nuanced -- apparently she is supposed to cry at eulogies.
The final Myers-Briggs polarity is judging/perceiving. This refers to attitudes about closure. People with a preference for judging like to be scheduled, organized, and know where they stand; people with a preference for perceiving are more spontaneous and open-ended. Hillary is a J, Bill is a big P.
Conclusion: Hillary Clinton: INTJ. Bill Clinton: ENFP.
What's the point? Since Hillary is in the spotlight, more or less 24/7, people assume that everything she does has some core meaning that has implications for her potential presidency or her character. But sometimes Hillary is just being an introvert, and that's that.