I thought it was found in a study that the most highly educated people tend conservative.
I've glossed over several summaries of related studies, and the general consensus isn't surprising: the more intelligent and/or educated a person is, the likelier they are to hold liberal views. Those less intelligent and/or educated are likelier to be conservative, and more likely to be aggressive and view force as an acceptable method of conflict resolution. I suspected this to be the case since authoritarians skew heavily to the right.
Thinking about it it makes sense. If a person is educated and intelligent they're very likely to accept scientific data, facts, etc, as the truths that they are. They're objective and informed, knowledgeable of the systems of society, etc, and that's going to help guide their political beliefs. The less intelligent and/or educated, the more likely they are to not know of these things in the first place or reject them in favor of purely political (and incorrect) notions that confirm their beliefs. Look at the average Fox News viewer.
A weird side note: I also recall a study that found conservatives are generally stronger than liberals. They actually gathered random conservatives and liberals and had them use different workout equipment or strength machines.
If there was ever a study that found the opposite to be true I have never come across it personally. The closest I recall reading is that one study found that the more intelligent and educated, the more a person earned (no surprise). And while these people often expressed liberal views regarding socioeconomic issues, when the chips were down, in private they actually supported conservative views that would keep them "on top".