2020 United States Senate election in Iowa
The 2020 United States Senate election in Iowa will be held on November 3, 2020, to elect a member of the United States Senate to represent the State of Iowa, concurrently with the 2020 U.S. presidential election, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections. Primaries were held on June 2.Republican primary
Candidates
Nominee
- Joni Ernst, incumbent U.S. Senator
Withdrawn
- Paul Rieck
Endorsements
Results
Democratic primary
Candidates
Nominee
- Theresa Greenfield, businesswoman, candidate for Iowa's 3rd congressional district in 2018
Eliminated in primary
- Michael T. Franken, retired U.S. Navy admiral and former aide to U.S. Senator Ted Kennedy
- Kimberly Graham, child welfare attorney
- Eddie Mauro, businessman, teacher, candidate for Iowa's 3rd congressional district in 2018
Withdrawn
- Cal Woods, journalist and U.S. Navy veteran ' '
Declined
- Cindy Axne, incumbent U.S. Representative for Iowa's 3rd congressional district
- Chet Culver, former Governor of Iowa
- Deirdre DeJear, nominee for Secretary of State of Iowa in 2018
- Abby Finkenauer, incumbent U.S. Representative for Iowa's 1st congressional district
- Amber Gustafson, candidate for the Iowa Senate in 2018
- Rita Hart, former state senator and nominee for Lieutenant Governor of Iowa in 2018
- Rob Hogg, state senator
- Liz Mathis, state senator
- Rob Sand, Iowa State Auditor
- J.D. Scholten, nominee for Iowa's 4th congressional district in 2018
- Tom Vilsack, former Governor of Iowa and former U.S. Secretary of Agriculture
- Stacey Walker, Linn County supervisor
- Steve Warnstadt, former state senator and intelligence officer in the Iowa Army National Guard
Debates
Endorsements
Polling
Results
Other candidates
Libertarian Party
Nominee
Declared
- Suzanne Herzog, economist and former ER nurse
General election
Predictions
Endorsements
Polling
Aggregate Polling
Theresa Greenfield vs. Joni Ernst
| Poll source | Date
administered | Sample
size | Margin
of error | Joni
Ernst | Theresa
Greenfield | Other/Undecided |
| July 11–16, 2020 | 701 | ± 3.7% | 43% | 45% | 12% |
| June 23–28, 2020 | 800 | ± 3.5% | 47% | 49% | 4% |
| June 7–10, 2020 | 674 | ± 3.8% | 43% | 46% | 11% |
| June 6–8, 2020 | 865 | ± 3.8% | 45% | 48% | 6% |
| June 3–4, 2020 | 963 | ± 3.4% | 43% | 45% | 12% |
| April 30 – May 1, 2020 | 1,222 | ± 2.8% | 43% | 42% | 14% |
| December 13–15, 2019 | 944 | ± 3.4% | 47% | 41% | 12% |
| October 13–16, 2019 | 888 | ± 3.2% | 47% | 40% | 14% |
| April 24–29, 2019 | 500 | ± 4.4% | 56% | 34% | – |
;with Eddie Mauro
| Poll source | Date
administered | Sample
size | Margin
of error | Joni
Ernst | Eddie
Mauro | Undecided |
| May 7–9, 2020 | 632 | ± 3.9% | 42% | 42% | – |
| April 24–29, 2019 | 500 | ± 4.4% | 58% | 33% | – |
| April 24–29, 2019 | 500 | ± 4.4% | 49% | 44% | – |
;with Joni Ernst and generic Democrat
| Poll source | Date
administered | Sample
size | Margin
of error | Joni
Ernst | Generic
Democrat | Undecided |
| April 29–30, 2019 | 780 | ± 3.5% | 48% | 44% | – |
| June 30 – July 1, 2017 | 784 | ± 3.6% | 48% | 41% | 12% |
;with Joni Ernst and Generic Opponent
| Poll source | Date
administered | Sample
size | Margin
of error | Joni
Ernst | Generic
Opponent | Other | Undecided |
| March 2–5, 2020 | 667 | ± 3.8% | 41% | 31% | 3% | 26% |
;with generic Republican and generic Democrat
| Poll source | Date
administered | Sample
size | Margin
of error | Generic
Republican | Generic
Democrat | Undecided |
| April 24–29, 2019 | 500 | ± 4.4% | 45% | 41% | – |
Results
