An article by Jim Giles published in New Scientist, and posted by the Center for Genetics and Society, surveys a variety of studies leading some people to see genetic factors in political inclinations, including liberal v. conservative, and likelihood to participate or not.
The studies include twin studies, gene studies and personality studies. This calls for some degree of skepticism, but some of it seems worthy of consideration.
The findings seem related to what used to be called “Individual Differences” in Ed Psych classes, and some of what is now treated as differences in “learning styles.” They suggest that factors beyond information and experience may be relevant to the success of “multicultural education.”
I am about the last person to accept biological reductionism, but some degree of openness to these lines of investigation might be in order — or maybe I’m just genetically predisposed to ambiguity and openness (traits considered by some of these studies in relation to more liberal political orientations).