Table S1. The Breadth of Values, Policy Views, & Identities by Knowledge

Table S2. The Breadth of Values, Policy Views, & Identities by Quiz Knowledge (1986–92)

Table S3. Reliability by Quiz Knowledge (1986–92)

Table S4. Most of the Same Quiz Items are Difficult to Work with in the Panels, and so I don't Replicate the Stability Tests with them here.

Table S5. Relating Ideological Constructs & Partisanship (Correl.) (1986–92)—Quiz Knowledge

Table S6. Predicting Presidential Votes (1988, 1992) (bivariate probit models)—Quiz Knowledge

Table S7. The Breadth of Values, Policy Views, & Identities by Knowledge—2008–16

Table S8. Reliability for Multiple Measures of Core Political Values & Policy Views—2008–16

Table S9. Relating Ideological Constructs & Partisanship—2008–16

Table S10. Ideology in Presidential Vote Choice, 2008–16 (Probit Models, 1 Predictor)

Table S11. Comparing Average Pearson’s (Continuous) vs. Polychoric (Ordinal) Inter‐item Correlations (1986–92)

Table S12. The Stability of Ideological Identification: Follow‐up for Moderates vs. Original Question