History bears out the opposite, at least on one side. The vanguard of the left has always been the most educated people in society. The more educated a culture becomes, the more left-wing it becomes. This trend is so widespread historically it is sound to take it as a rule of political development

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i think there's less intelligent people on the extremes. those are the people that are heavily influenced by the people around them, and dont think deeply about their beliefs, just taking in whatever they're fed.

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I think it kind of depends what you mean by the edge of either side? intelligent people tend to have an actual cohesive idea of their political position instead of just aligning with a party. That means they’re less likely to just say they’re strongly republican or democrat, but I’ve met plenty of very intelligent socialists.

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This

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The less intelligent you are the deeper you are in a party

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