- Beyond Red vs. Blue: The Political Typology Pew Research Center
- Study splits Americans into nine political groups. Where do you belong? The Washington Post
- Pew survey reveals a rainbow of beliefs within red v. blue politics Courthouse News
- New Pew typology finds most Americans fall between political extremes Fingerlakes1.com
- Appendix C: The history of the political typology Pew Research Center
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