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.
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58Senate polls by Monmouth University Polling Institute.
Polls per month
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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 24–28, 2024 | 2024 United States Senate election in Pennsylvania (2024) | A− Monmouth University Polling Institute | — | 824 | RV | — | Jr. 45 · McCormick 44 | D+1 | — | — | Release |
| Oct 15–19, 2020 | 2020 United States Senate election in Iowa (2020)Not averaged | A− Monmouth University Polling Institute | — | 501 | LV | — | Greenfield 51 · Ernst 45 | D+6 | — | — | Release |
| Oct 15–19, 2020 | 2020 United States Senate election in Iowa (2020) | A− Monmouth University Polling Institute | — | 501 | LV | — | Greenfield 49 · Ernst 47 | D+2 | — | — | Release |
| Oct 15–19, 2020 | 2020 United States Senate election in Iowa (2020)Not averaged | A− Monmouth University Polling Institute | — | 501 | RV | — | Greenfield 47 · Ernst 47 | Even | — | — | Release |
| Oct 9–13, 2020 | 2020 United States Senate special election in Arizona (2020)Not averaged | A− Monmouth University Polling Institute | — | 502 | LV | — | Kelly 51 · McSally 45 | D+6 | — | — | Release |
| Oct 9–13, 2020 | 2020 United States Senate special election in Arizona (2020) | A− Monmouth University Polling Institute | — | 502 | LV | — | Kelly 52 · McSally 42 | D+10 | — | — | Release |
| Oct 9–13, 2020 | 2020 United States Senate special election in Arizona (2020)Not averaged | A− Monmouth University Polling Institute | — | 502 | RV | — | Kelly 52 · McSally 42 | D+10 | — | — | Release |
| Oct 8–11, 2020 | 2020 United States Senate election in North Carolina (2020)Not averaged | A− Monmouth University Polling Institute | — | 500 | LV | — | Cunningham 48 · Tillis 47 | D+1 | — | — | Release |
| Oct 8–11, 2020 | 2020 United States Senate election in North Carolina (2020) | A− Monmouth University Polling Institute | — | 500 | LV | — | Cunningham 49 · Tillis 44 | D+5 | — | — | Release |
| Oct 8–11, 2020 | 2020 United States Senate election in North Carolina (2020)Not averaged | A− Monmouth University Polling Institute | — | 500 | RV | — | Cunningham 48 · Tillis 44 | D+4 | — | — | Release |
| Sep 18–22, 2020 | 2020 United States Senate election in Iowa (2020)Not averaged | A− Monmouth University Polling Institute | — | 402 | LV | — | Greenfield 48 · Ernst 47 | D+1 | — | — | Release |
| Sep 18–22, 2020 | 2020 United States Senate election in Iowa (2020) | A− Monmouth University Polling Institute | — | 402 | LV | — | Greenfield 49 · Ernst 46 | D+3 | — | — | Release |
| Sep 18–22, 2020 | 2020 United States Senate election in Iowa (2020)Not averaged | A− Monmouth University Polling Institute | — | 402 | RV | — | Greenfield 47 · Ernst 47 | Even | — | — | Release |
| Sep 11–15, 2020 | 2020 United States Senate special election in Arizona (2020)Not averaged | A− Monmouth University Polling Institute | — | 420 | LV | — | Kelly 49 · McSally 48 | D+1 | — | — | Release |
| Sep 11–15, 2020 | 2020 United States Senate special election in Arizona (2020) | A− Monmouth University Polling Institute | — | 420 | LV | — | Kelly 50 · McSally 46 | D+4 | — | — | Release |
| Sep 11–15, 2020 | 2020 United States Senate special election in Arizona (2020)Not averaged | A− Monmouth University Polling Institute | — | 420 | RV | — | Kelly 50 · McSally 44 | D+6 | — | — | Release |
| Aug 29–Sep 1, 2020 | 2020 United States Senate election in North Carolina (2020)Not averaged | A− Monmouth University Polling Institute | — | 401 | LV | — | Cunningham 46 · Tillis 46 | Even | — | — | Release |
| Aug 29–Sep 1, 2020 | 2020 United States Senate election in North Carolina (2020) | A− Monmouth University Polling Institute | — | 401 | LV | — | Cunningham 47 · Tillis 45 | D+2 | — | — | Release |
| Aug 29–Sep 1, 2020 | 2020 United States Senate election in North Carolina (2020)Not averaged | A− Monmouth University Polling Institute | — | 401 | RV | — | Cunningham 46 · Tillis 45 | D+1 | — | — | Release |
| Jul 30–Aug 3, 2020 | 2020 United States Senate election in Iowa (2020)Not averaged | A− Monmouth University Polling Institute | — | 401 | LV | — | Greenfield 47 · Ernst 48 | R+1 | — | — | Release |
| Jul 30–Aug 3, 2020 | 2020 United States Senate election in Iowa (2020) | A− Monmouth University Polling Institute | — | 401 | LV | — | Greenfield 47 · Ernst 48 | R+1 | — | — | Release |
| Jul 30–Aug 3, 2020 | 2020 United States Senate election in Iowa (2020)Not averaged | A− Monmouth University Polling Institute | — | 401 | RV | — | Greenfield 45 · Ernst 48 | R+3 | — | — | Release |
| Apr 16–19, 2020 | 2020 United States Senate election in New Jersey (2020) | A− Monmouth University Polling Institute | — | 635 | RV | — | Booker 55 · Mehta 32 | D+23 | — | — | Release |
| Mar 11–14, 2020 | 2020 United States Senate special election in Arizona (2020) | A− Monmouth University Polling Institute | — | 847 | RV | — | Kelly 50 · McSally 44 | D+6 | — | — | Release |
| Oct 11–15, 2018 | 2018 United States Senate election in New Jersey (2018) | A− Monmouth University Polling Institute | — | 527 | V | — | Menendez 49 · Hugin 40 | D+9 | — | — | Release |
| Jun 14–19, 2018 | 2018 United States Senate election in West Virginia (2018)Not averaged | A− Monmouth University Polling Institute | — | 653 | V | — | Manchin 48 · Morrisey 39 | D+9 | — | — | Release |
| Jun 14–19, 2018 | 2018 United States Senate election in West Virginia (2018) | A− Monmouth University Polling Institute | — | 653 | V | — | Manchin 49 · Morrisey 42 | D+7 | — | — | Release |
| Apr 6–10, 2018 | 2018 United States Senate election in New Jersey (2018) | A− Monmouth University Polling Institute | — | 632 | V | — | Menendez 53 · Hugin 32 | D+21 | — | — | Release |
| Oct 30–Nov 2, 2016 | 2016 United States Senate election in Utah (2016) | A− Monmouth University Polling Institute | — | 402 | V | — | Snow 28 · Lee 61 | R+33 | — | — | Release |
| Oct 29–Nov 1, 2016 | 2016 United States Senate election in Pennsylvania (2016) | A− Monmouth University Polling Institute | — | 403 | V | — | McGinty 47 · Toomey 44 | D+3 | — | — | Release |
| Oct 28–31, 2016 | 2016 United States Senate election in Missouri (2016) | A− Monmouth University Polling Institute | — | 405 | V | — | Kander 46 · Blunt 47 | R+1 | — | — | Release |
| Oct 27–30, 2016 | 2016 United States Senate election in Indiana (2016) | A− Monmouth University Polling Institute | — | 402 | V | — | Bayh 45 · Young 45 | Even | — | — | Release |
| Oct 22–25, 2016 | 2016 United States Senate election in New Hampshire (2016) | A− Monmouth University Polling Institute | — | 401 | V | — | Hassan 46 · Ayotte 46 | Even | — | — | Release |
| Oct 21–24, 2016 | 2016 United States Senate election in Arizona (2016) | A− Monmouth University Polling Institute | — | 401 | V | — | Kirkpatrick 40 · McCain 50 | R+10 | — | — | Release |
| Oct 20–23, 2016 | 2016 United States Senate election in North Carolina (2016) | A− Monmouth University Polling Institute | — | 402 | V | — | Ross 43 · Burr 49 | R+6 | — | — | Release |
| Oct 15–18, 2016 | 2016 United States Senate election in Wisconsin (2016) | A− Monmouth University Polling Institute | — | 403 | V | — | Feingold 52 · Johnson 44 | D+8 | — | — | Release |
| Oct 14–17, 2016 | 2016 United States Senate election in Nevada (2016) | A− Monmouth University Polling Institute | — | 413 | LV | — | Masto 42 · Heck 45 | R+3 | — | — | Release |
| Oct 11–13, 2016 | 2016 United States Senate election in Indiana (2016) | A− Monmouth University Polling Institute | — | 402 | V | — | Bayh 48 · Young 42 | D+6 | — | — | Release |
| Oct 10–12, 2016 | 2016 United States Senate election in Utah (2016) | A− Monmouth University Polling Institute | — | 403 | V | — | Snow 31 · Lee 60 | R+29 | — | — | Release |
| Oct 9–11, 2016 | 2016 United States Senate election in Missouri (2016) | A− Monmouth University Polling Institute | — | 406 | V | — | Kander 44 · Blunt 46 | R+2 | — | — | Release |
| Oct 1–4, 2016 | 2016 United States Senate election in Ohio (2016) | A− Monmouth University Polling Institute | — | 405 | V | — | Strickland 39 · Portman 54 | R+15 | — | — | Release |
| Sep 30–Oct 3, 2016 | 2016 United States Senate election in Pennsylvania (2016) | A− Monmouth University Polling Institute | — | 402 | V | — | McGinty 46 · Toomey 46 | Even | — | — | Release |
| Sep 29–Oct 2, 2016 | 2016 United States Senate election in Colorado (2016) | A− Monmouth University Polling Institute | — | 400 | V | — | Bennet 53 · Glenn 35 | D+18 | — | — | Release |
| Sep 17–20, 2016 | 2016 United States Senate election in New Hampshire (2016) | A− Monmouth University Polling Institute | — | 400 | V | — | Hassan 45 · Ayotte 47 | R+2 | — | — | Release |
| Sep 16–19, 2016 | 2016 United States Senate election in Florida (2016) | A− Monmouth University Polling Institute | — | 400 | V | — | Murphy 45 · Rubio 47 | R+2 | — | — | Release |
| Sep 15–18, 2016 | 2016 United States Senate election in Georgia (2016) | A− Monmouth University Polling Institute | — | 401 | V | — | Barksdale 34 · Isakson 50 | R+16 | — | — | Release |
| Sep 12–14, 2016 | 2016 United States Senate election in Iowa (2016) | A− Monmouth University Polling Institute | — | 404 | V | — | Judge 39 · Grassley 56 | R+17 | — | — | Release |
| Sep 11–13, 2016 | 2016 United States Senate election in Nevada (2016) | A− Monmouth University Polling Institute | — | 406 | LV | — | Masto 43 · Heck 46 | R+3 | — | — | Release |
| Aug 27–30, 2016 | 2016 United States Senate election in Wisconsin (2016) | A− Monmouth University Polling Institute | — | 404 | V | — | Feingold 54 · Johnson 41 | D+13 | — | — | Release |
| Aug 26–29, 2016 | 2016 United States Senate election in Pennsylvania (2016) | A− Monmouth University Polling Institute | — | 402 | V | — | McGinty 45 · Toomey 41 | D+4 | — | — | Release |
Showing 1–50 of 58
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)