Psychology Today:

"All people are born alike-except Republicans and Democrats," quipped Groucho Marx, and in fact it turns out that personality differences between liberals and conservatives are evident in early childhood. In 1969, Berkeley professors Jack and Jeanne Block embarked on a study of childhood personality, asking nursery school teachers to rate children's temperaments. They weren't even thinking about political orientation. Twenty years later, they decided to compare the subjects' childhood personalities with their political preferences as adults. They found arresting patterns. As kids, liberals had developed close relationships with peers and were rated by their teachers as self-reliant, energetic, impulsive, and resilient. People who were conservative at age 23 had been described by their teachers as easily victimized, easily offended, indecisive, fearful, rigid, inhibited, and vulnerable at age 3. The reason for the difference, the Blocks hypothesized, was that insecure kids most needed the reassurance of tradition and authority, and they found it in conservative politics.

I know our right wing commenters are going to think this is a cheap shot against conservatives, and that is sincerely not my intent. I just find this report fascinating in how different inclinations manifest themselves from childhood into adulthood. Certainly, everything I was exposed to in my childhood have informed my politics and worldview. And now part of what I do for my off line job is teach children. I know which children need structure and respond more to authoritarian commands from me and which kids like me being more casual and jokey with them. I'd love to catch up with my students again in 20 years to see if these hypotheses bear out on their political leanings.