Polls database
Every poll we use, with its source
11,685 polls since 2015: national questions, Senate, House, governor and state legislative races, presidential primaries and ballot measures. Filter, then open any poll’s release.
Pollster: Opinion Insight Remove ×
Matching polls
2Senate polls by Opinion Insight.
Polls per month
1
Sep 2020Oct 2020
Latest poll in the database ended Nov 2, 2026. Source: 99chambers polls database
| Dates | Question | Pollster | Sponsor | Sample | Pop. | Mode | Result | Margin | Adjusted | vs result | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 5–8, 2020 | 2020 United States Senate election in Iowa (2020) | — Opinion Insight | The American Action Forum | 800 | LV | — | Greenfield 45 · Ernst 47 | R+2 | — | — | Release |
| Aug 30–Sep 2, 2020 | 2020 United States Senate election in Iowa (2020) | — Opinion Insight | The American Action Forum | 800 | LV | — | Greenfield 43 · Ernst 49 | R+6 | — | — | Release |
Showing 1–2 of 2
Adjusted: after house-effect and population corrections. vs result: margin minus the certified or unofficial result. Latest poll in the database ended Nov 2, 2026. Source: each poll’s own release, as cited by the poll list it was compiled from (The New York Times for Senate, governor and House races; Wikipedia for other offices)