10 final polls from 2008 to 2008 (average error 4.7 points): too few to grade. Crosstab grades every 2026 pollster on its own results after Election Day.
Open Big Ten in the interactive Trust Index All pollster ratings
Big Ten has 10 final polls in the 1998–2022 results data, too few to receive a grade (at least 20 graded polls are needed). Its average error was 4.7 points.
Historically, Big Ten's misses leaned D+4.2 on average. Lean describes how its numbers compare; it isn't an accusation of bias.
Grades: Crosstab Trust Index, computed from FiveThirtyEight's pollster-ratings data (CC BY 4.0), 1998–2022; 2026 measures from Crosstab's polling data.
Updated 2026-10-04 · Crosstab, nonpartisan polling analysis.