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From what I've learned about the brain, the size of any one component does tend to correlate with the intensity of its neural activity - more networks, more myelinated axons, more bulk. Not only is the amygdala associated with fear reactions but it is also heavily involved in almost all of the emotional responses that make up our 'survival instincts' as well as the retention of emotion-based memory so obviously the quality (hardship or relative ease) of one's life is going to affect the size of the amygdala, as well. So I'm not sure you could easily make a case that its size necessarily correlates with political opinion. After all, I'm a liberal and I certainly do fear the consequences of unchecked conservatism in this country. I quite literally fear it.
Overall, I tend to agree with Baraka's observation that the brain is a very complex organ and there are many 'higher' brain functions that contribute to the formation of things like values and opinions (not to mention experience and memory) - so much so that I would think it to be quite difficult to pin down something as vague as 'political attitude' on the observation of one area of the brain.
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Most people go through life dreading they'll have a traumatic experience. Freaks were born with their trauma. They've already passed their test in life. They're aristocrats. - Diane Arbus
PESSIMISM, n. A philosophy forced upon the convictions of the observer by the disheartening prevalence of the optimist with his scarecrow hope and his unsightly smile. - Ambrose Bierce
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