Copyright 2016 NPR. To see more, visit MARTIN, HOST: It's no secret that this presidential campaign season has been tense, with disagreement and rancor even louder than usual. (SOUNDBITE OF ARCHIVED RECORDING) UNIDENTIFIED MAN #1: You know, people are actually watching this at home. (SOUNDBITE OF ARCHIVED RECORDING) HILLARY CLINTON: Well, that's because he'd rather have a puppet as president than... DONALD TRUMP: No puppet. No puppet... CLINTON: And... (SOUNDBITE OF ARCHIVED RECORDING) UNIDENTIFIED MAN #2: (Unintelligible) our borders (ph)... UNIDENTIFIED WOMAN: You cheated. MARTIN: The discord highlights what seems to be an ever-widening political gap in our country. There are many theories to explain it - race, religion, gender. The list is long. For NPR's Hidden Brain podcast, social science correspondent Shankar Vedantam explored another idea. Could a driving force behind our political preferences be rooted deep inside the brain, hidden even to ourselves? We start with two voters
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