Do People Naturally Cluster into Liberals and Conservatives?

Many researchers have attempted to link evolutionary notions to political psychology by proposing a natural tendency for people to cluster into liberals and conservatives across various social and economic opinion domains. We review evidence showing that, in contrast, for the large majority of Americans, racial and economic opinions are only trivially correlated with opinions regarding matters of lifestyle and religious fundamentalism. The key exception is a group that does, in fact, show reasonably robust ideological alignment across diverse domains: whites with high levels of human capital (measured by education and test performance). Further, since the early 1980s, while the US public as a whole has increasingly tended to choose liberal/conservative labels and political parties in line with their issue opinions, substantial increases in cross-issue correlations have occurred only among whites with high levels of human capital. Nonetheless, mass public opinion is not unstructured—it maintains an underlying coherence grounded in domain-specific demographic connections relating to different opinion areas. © 2015, Springer International Publishing.