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Harvard University · 2006–2025 · individual responses
Large online survey of American adults run by a consortium of university teams and fielded by YouGov. Even years: about 50,000-65,000 respondents interviewed before (Oct) and after (Nov) the election; odd years: 10,000-26,000 respondents in Nov-Dec. Common Content covers demographics, partisanship, approval, economic perceptions, and policy batteries.
| Poll | Field dates | Mode | Population | Respondents |
|---|---|---|---|---|
| Cooperative Election Study 2025 | 2025-11-05 to 2025-12-12 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 17,000 |
| Cooperative Election Study 2024 | 2024-10-01 to 2024-12-09 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 60,000 |
| Cooperative Election Study 2023 | 2023-11-08 to 2023-12-11 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 24,500 |
| Cooperative Election Study 2022 | 2022-09-29 to 2022-12-15 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 60,000 |
| Cooperative Election Study 2021 | 2021-11-03 to 2021-12-07 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 25,700 |
| Cooperative Election Study 2020 | 2020-09-29 to 2020-12-14 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 61,000 |
| Cooperative Congressional Election Study 2019 | 2019-11-06 to 2019-12-05 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 18,000 |
| Cooperative Congressional Election Study 2018 | 2018-09-27 to 2018-11-05 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 60,000 |
| Cooperative Congressional Election Study 2017 | 2017-11-08 to 2017-12-12 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 18,200 |
| Cooperative Congressional Election Study 2016 | 2016-09-28 to 2016-11-07 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 64,600 |
| Cooperative Congressional Election Study 2015 | 2015-11-06 to 2015-12-03 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 14,250 |
| Cooperative Congressional Election Study 2014 | 2014-10-01 to 2014-11-03 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 56,200 |
| Cooperative Congressional Election Study 2013 | 2013-11-06 to 2013-12-03 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 16,400 |
| Cooperative Congressional Election Study 2012 | 2012-10-01 to 2012-11-05 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 54,535 |
| Cooperative Congressional Election Study 2011 | 2011-11-09 to 2012-01-07 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 20,150 |
| Cooperative Congressional Election Study 2010 | 2010-10-01 to 2010-11-01 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 55,400 |
| Cooperative Congressional Election Study 2009 | 2009-11-05 to 2009-12-14 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 13,800 |
| Cooperative Congressional Election Study 2008 | 2008-10-08 to 2008-11-03 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 32,800 |
| Cooperative Congressional Election Study 2007 | 2007-11-09 to 2007-12-10 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 9,999 |
| Cooperative Congressional Election Study 2006 | 2006-10-07 to 2006-11-08 | web | US adults 18+ (YouGov opt-in panels, sample-matched to an ACS frame and weighted) | 36,421 |