As you may surmise by the way fans of right-wing commentator Rush Limbaugh refer to themselves as “dittoheads,” studies indicate that conservative people have a higher need for “shared reality.” Liberals, on the other hand, tend toward the opposite — rather than wanting to share the same reality with their kin, they’re more motivated to be unique, agreeing with statements like “in group activities, I’m somewhat of a nonconformist,” while conservatives are more likely to agree that it’s important to them to “see the world in a similar way” as others do. And in matters both political (abortion) and nonpolitical (coffee) conservatives are more likely to overestimate how much their beliefs match those of their fellow conservatives, while liberals underestimate how much their beliefs are like other liberals. And guess what: According to Stern’s research, people who report that they think their peers share their beliefs with them are more likely to vote.