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That is not true . At least in my experience . All the rational people I've ever met in my whole life was liberal and big chunk of them were disappointed in political system (which makes them out of spectrum in left side ). For example even Noam Chomsky (which is far left in today US definition) prefer Obama (despite he knows Obama is just another politician who work for wall street instead of people ,but at least he is not going to put country in danger) to some crazy person at the other hand. I was fairly disappointed when I saw that comment down voted in HN . And I am from other country , I can see (in compare to my country) how exactly Right wing using deceive people with its control over money/media.

About the monopoly maybe your left wing is Clinton ( which don't have any monopoly on rational people , because all know she is clown of wall street) , but true left wing (like Lessig Lawrence / Bernie Sanders / etc ) completely have monopoly on rational people in compare to right side , specially academic people in human science branches.