We've gone way beyond politics, but I agree (assuming I am in agreement) that personality has a great deal to do with Party affiliation. There are other influences as well, but our mental makeup determines who we tend to group with. What we have in America is a group of old white men who are losing their grip on power and they'll do anything to keep in control. They are frightened, afraid of change, afraid of anyone who looks differently, believes differently, dresses differently. You can easily see this seeping out in the many posts made to this forum.
"We regard political conservatism as an ideological belief system that is significantly (but not completely) related to motivational concerns having to do with the psychological management of uncertainty and fear. Specifically, the avoidance of uncertainty (and the striving for certainty) may be particularly tied to one core dimension of conservative thought, resistance to change (Wilson, 1973c). Similarly, concerns with fear and threat may be linked to the second core dimension of conservatism, endorsement of inequality (Sidanius & Pratto, 1999)." http://www.sulloway.org/PoliticalConservatism(2003).pdf