OceanicPilot is correct. The quiz is explained in this article:

Study Shows Smart Liberals, Conservatives, and Libertarians Are Easiest to Fool - Reason.com

Basically, a Professor at MIT wanted to know what kind of people tend to jump to a wrong answer even when they have excellent math skills. It turned out that overconfidence mattered more than whether the person was liberal or conservative. (Not really surprising.)
"...the smarter you are, the easier it is to fool yourself."