Over the last several decades, Republicans have become increasingly extroverted, in comparison to Democrats, who for the most part tend to be pretty much evenly split across the introvert/extrovert spectrum, maybe with a bit more lean toward introversion.
There is a fairly strong correlation between extreme extroversion, low intelligence (broadly), and narcissism/psychopathy. They share a lot of common traits:
* They are very status conscious and tend to see the world in terms of hierarchies. Success is being at or near the top of their respective hierarchy, and those below them in the hierarchy are their inferiors.
* They are frequently bullies, preferring to intimidate inferiors as one way of establishing social position
* They are very linear thinkers, and have trouble dealing with abstractions and systemic thinking. They have poor reasoning skills, and tend towards more "magical" thinking that makes them especially gullible.
* The further one is from the ideal at the top of the hierarchy, the less value they have to members of that hierarchy
* They are close-minded to ideas outside of those in the in-group, even when those ideas more closely align with reality.
* Position in the hierarchy is far more important than whether they do good or not, and they have difficulty seeing people in the outgroup as having any good qualities.
* Weakness is not a problem to be solved, but a trait used to discriminate.
* Cheating is perfectly acceptable as long as it is not done within the in-group - this is seen simply as "gaming the system".
* They are not empathic, though they can feign it by appearing magnanimous in public.
* They are not stupid, but they tend to score lower on traditional measures of intelligence (and, oh, do they hate this).
* They generally do not recognize their own lack of competence, and have trouble in gauging the competence of others.
* They are willing to do anything to get ahead, which is why they usually do well financially in the short term (in the long term the mistakes they make mean they are as likely to lose their fortunes as to make them bigger). Introverts generally do better financially over their lifetime, as it represents increased competence and a more measured approach to wealth acquisition.
* They are gullible, in part because they lack critical thinking skills and are more easily led by greed or avarice.
Good extroverts recognize these tendencies, and usually tend to surround themselves by more introverted advisors, however, this also requires a degree of self-awareness that is usually lacking towards the extreme end of the spectrum.
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