10 final polls from 2013 to 2020 (average error 1.8 points): too few to grade. Crosstab grades every 2026 pollster on its own results after Election Day.
6 polls this cycle; its polls have been 0.8 points more Democratic than other polls of the same races (raw gap D+1.3, adjusted for its 6 polls); spread 0.83× what its sample sizes predict.
| Date | Poll | Result | vs. other polls |
|---|---|---|---|
| 08-10 | North Carolina Senate | Cooper 52, Whatley 39 | D+4.8 |
| 05-11 | North Carolina Senate | Cooper 50, Whatley 39 | D+3.5 |
| 03-23 | North Carolina Senate | Cooper 49, Whatley 41 | R+3.3 |
| 11-10 | North Carolina Senate | Cooper 47, Whatley 39 | D+1.5 |
| 09-15 | North Carolina Senate | Cooper 46, Whatley 42 | R+2.5 |
| 08-12 | North Carolina Senate | Cooper 47, Whatley 39 | D+3.5 |
States polled: North Carolina.
Open Harper Polling in the interactive Trust Index All pollster ratings
Harper Polling 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 1.8 points.
Historically, Harper Polling's misses leaned D+1.7 on average. In 2026 its polls have been 0.8 points more Democratic than other polls of the same races. Lean describes how its numbers compare; it isn't an accusation of bias.
6 polls in Crosstab's data, including North Carolina Senate.
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.