Have you read this intriguing book, the Hidden Brain?:
" But many of the test subjects that you talk about in the book are schoolchildren being taught that racism is bad. Why does this kind of subconscious racism persist?
Because the hidden brain doesn't always learn what it's taught to learn. We can consciously teach people that certain attitudes are right or wrong, but that does little to alter the hidden brain. It's a much dumber system that learns much more through repetition and blind argument and making associations. When you're watching television, for example, the hidden brain is watching who is being shown in positions of authority. It's not something you need to think about on a conscious level. By the time a child is 1 or 2 or 3 or 4, he or she has seen thousands of these kinds of associations.
~snip
One surprising connection you make in the book is between racism and voting records. Are Republicans really more likely to be racist?
The research specifically makes a connection between racial bias and whether congressional districts vote Republican or liberal -- in that sense I do make that connection.
The research data shows that a significant number of Americans show biases that are pro-white and anti-black in the United States. It's true for Democrats and Republicans, but if you were to draw a map of where these people are in the country geographically and measure how much racial bias they have, there is a correlation between the degree of racial bias and political orientation. Districts with the highest racial bias vote Republicans, districts with the lowest racial bias tend to vote Democrat. There are other factors at play, but generally it holds true."
http://www.salon.com/books/neuroscience/index.html