84-309 · American Political Divides and Great Debates · Fall 2026
Polarization III — Affective Polarization Iyengar et al. 2019, rebuilt from the ANES and carried past 2016. Drag the end year to see what the article could see; put your own two thermometer ratings on the national series. Polarization II — Sorting Mason 2015, and how she counts it. Answer the two survey questions and your own square is marked on every grid; drag the year slider from 1972 to 2024. Bigger Than They Are What the parties are made of, what Americans think they are made of, and what our class guessed. Ahler & Sood 2018. The Parties in Our Heads Reading companion — every number with its source, the vocabulary, and questions for discussion. Guess the Parties The eight questions cold, scored against the truth, against this class, and against the national sample.