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The most comprehensive review of personality and political orientation to date is a 2003 meta-analysis of 88 prior studies involving 22,000 participants. The researchers—John Jost of NYU, Arie Kruglanski of the University of Maryland, and Jack Glaser and Frank Sulloway of Berkeley—found that conservatives have a greater desire to reach a decision quickly and stick to it, and are higher on conscientiousness, which includes neatness, orderliness, duty, and rule-following. Liberals are higher on openness, which includes intellectual curiosity, excitement-seeking, novelty, creativity for its own sake, and a craving for stimulation like travel, color, art, music, and literature.
The study’s authors also concluded that conservatives have less tolerance for ambiguity, a trait they say is exemplified when George Bush says things like, "Look, my job isn’t to try to nuance. My job is to tell people what I think," and “I’m the decider.” Those who think the world is highly dangerous and those with the greatest fear of death are the most likely to be conservative.
source: abovetopsecret.com/forum/thread595311/pg1Liberals, on the other hand, are “more likely to see gray areas and reconcile seemingly conflicting information,” says Jost.