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Die-hard liberals and conservatives aren't made; they're born. It's literally in their DNA.
That's the implication of a study by a group of researchers who wanted to see if there was a biological basis for people's political attitudes.
They found to their surprise that opinions on such contentious subjects as gun control, pacifism and capital punishment are strongly associated with physiological traits that are probably present at birth.
Fowler said the study added to the growing research suggesting that over millions of years, humans have developed two cognitive styles -- conservative and liberal. Cautious conservatives prevented societies from taking undue risks, while more flexible liberals fostered cooperation.
"For the species to survive, you need both," he said.