When a bunch of Democrats voted last week for a Republican bill meant to sabotage the Affordable Care Act, a lot of liberal commentators, myself included, reacted with, "Ugh, here we go again." While there had been some remarkable unity on the Democratic side in recent months, particularly during the budget showdown, the default status of Democrats is not just cowardice but fractiousness (though obviously, it's easy to stay together when things are going well). This is representative of the broader liberal movement, where it's extraordinarily difficult to get ostensibly allied people and groups to act in concert. Liberals are always looking with envy at their conservative counterparts, who seem to be much more unified, both in beliefs and action. Conservatives would tell you that they spend plenty of time at each other's throats, but this broad stereotype—disconnected liberals, unified conservatives—has its origins in truth.
Today I read a study that sheds some light on why this might be. It isn't just that liberals are more divided and conservatives are more united, it's also that liberals believe they're more divided, and conservatives believe they're more unified, even when it's not necessarily true. The study asked people about their opinions on a range of questions on both political and non-political topics, then asked them to guess what proportion of people who shared their general ideology agreed with them on that particular question. The results showed that liberals displayed a "truly false uniqueness effect"—they were more likely to think that their views were different from those of their peers, even when they weren't—while conservatives displayed a "truly false consensus effect," believing that their views were the same as their peers, even when they weren't.