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https://www.theatlantic.com/amp/article/583072/
Based on the survey results, Tobias Konitzer, the co-founder of PredictWise, investigated which demographic characteristics seemed to correlate with partisan prejudice. He found, for example, that age, race, urbanicity, partisan loyalty, and education did coincide with more prejudice (but gender did not). In this way, he created a kind of profile of contemporary partisan prejudice.
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Nationwide, if we disregard the smallest counties (which may be hard to pin down statistically, since they have fewer than 100,000 people), the most politically intolerant county in America appears to be Suffolk County, Massachusetts, which includes the city of Boston. In this part of the country, nine out of every 10 couples appear to share the same partisan leaning, according to the voter-file data. Eight out of every 10 neighborhoods are politically homogeneous. This means that people in Boston may have fewer “cross-cutting relationships,” as researchers put it. It is a very urban county with a relatively high education level. All these things tend to correlate with partisan prejudice.