Well, this seems timely... The Geography of Partisan Prejudice, brought to you earlier this week by the folks over at The Atlantic. As the title suggests, the focus is on geography, but early in the article there's an acknowledgement that there are demographic trends as well. This sums up the non-geographic component pretty well: "In general, the most politically intolerant Americans, according to the analysis, tend to be whiter, more highly educated, older, more urban, and more partisan themselves". and "... white, highly educated people are relatively isolated from political diversity. They don’t routinely talk with people who disagree with them; this isolation makes it easier for them to caricature their ideological opponents." It's a pretty interesting read even without the context of the current discussion. Geographically FL, SC, MA, VA, and the Rust Belt states jump off the page as higher in prejudice than the national average, but the map lets you mouse over individual counties. As the demographic tendency would seem to indicate, the Twin Cities rates relatively high for partisan prejudice by both D's and R's. Ironically the article allows a basic political prejudice into its own discussion of the subject, misleadingly making 'no abortion' supporters out to be alone on a minority island, when in fact 'unlimited abortion' supporters are also a smaller minority than the plurality who believe in legal abortion with limits.