"Although it is not true that all conservatives are stupid, it is true that most stupid people are conservative."

Scientific proof that John Stuart Mill was correct.

Evolutionary psychologist Satoshi Kanazawa at the the London School of Economics and Political Science correlated data on these behaviors with IQ from a large national U.S. sample and found that, on average, people who identified as liberal and atheist had higher IQs.

[...]

The study found that young adults who said they were "very conservative" had an average adolescent IQ of 95, whereas those who said they were "very liberal" averaged 106.

So very liberal people are typically above average, and very wingnutty people are typically below average.

Sounds right to me.