Groucho Marx said that.
Psychology Today has an article, The Ideological Animal, on psycho-social differences between self-described liberals and conservatives.
It certainly explains a lot of the uummm... shall I call them challenges of my dating life. I supposed now it's documented why the last guy I was forced to endure thought the Big Thiefs of Enron were right to maximize their own self interest and why I couldn't bring myself to leave the said guy abandoned on the side of the road. No matter how much I wanted to!
It's a long, detailed article but well worth the time to read if you like trying to figure out what makes people tick.