As election campaign heats up and the attitudes harden, it's worth remembering that our deeply help political beliefs — the ones that seem so self-evidently true — are a somewhat malleable, largely accidental product of our genetic makeup and early life experiences. Researchers are far from certain why one person becomes a liberal and another a conservative, but they have come up with some intriguing findings.

http://www.psmag.com/politics/five-reasons-you-vote-the-way-you-do-47824/#