In a national survey, [political scientist Dan] Cassino examined belief in political conspiracy theories on both the left and also the right. He did so by asking Americans about two “liberal” conspiracy beliefs—the 9/11 “Truther” conspiracy, and the idea that George W. Bush stole the 2004 election—and two conservative ones: the “Birther” theory that Barack Obama was born in Kenya, and the claim that he stole the 2012 vote.
The results were hardly symmetrical. First, 75 percent of Republicans, but only 56 percent of Democrats, believed in at least one political conspiracy theory. But even more intriguing was the relationship between one’s level of political knowledge and one’s conspiratorial political beliefs. Among Democrats and independents, having a higher level of political knowledge was correlated with decreased belief in conspiracies. But precisely the opposite was the case for Republicans, where knowledge actually made the problem worse. For each political knowledge question that they answered correctly, Republicans’ belief in at least one conspiracy theory tended to increase by 2 percentage points.