Strong evidence for group-interested voting, with race being the main group of interest. Self-interest plays a marginal role at most. There are many different ways to analyze political beliefs. On a deep level, this spectrum may not make a great deal of sense. But again empirically, most people line up on the diagonal, and the other two boxes are sparsely inhabited.
More educated people tend to be both more tolerant and more appreciative of free markets.
This fact suggests that politicians might really compete over two dimensions rather than one. Education affects issue beliefs, but appears to be independent of party identification. It seems to conflict with the logic of collective action - people sacrifice their own political interests without hope of compensation. But this impression is misleading. Of course not.