Elections / 2020 · Senate · IA
The Republican candidate won Iowa's Senate seat R+6.6.
Iowa, 2020. Candidate results and statewide totals below. The presidential race shared this ballot.
Iowa — 2020 Senate result
Source: MIT Election Data + Science Lab, 1976–2024 Senate returns (party-classified by literal ballot party).
Democratic (D)
754,859
45.2%
Republican (R)
864,997
51.8%
All others
50,761
3.0%
Margin
R+6.6
Candidates
Statewide candidate totals — MIT Election Data + Science Lab, 2020 Senate returns.
| Candidate | Party | Votes | Share |
|---|---|---|---|
| Joni Ernst | RRepublican | 864,997 | 51.8% |
| Theresa Greenfield | DDemocrat | 754,859 | 45.2% |
| Rick Stewart | OLibertarian | 36,961 | 2.2% |
| Suzanne Herzog | OOther | 13,800 | 0.8% |
Iowa's Senate margins
Every contest in our store, 1978–2022
| Year | Margin (D minus R) |
|---|---|
| 1978 | −3.2% |
| 1980 | −7.9% |
| 1984 | +11.8% |
| 1986 | −32.5% |
| 1990 | +9.1% |
| 1992 | −42.4% |
| 1996 | +5.1% |
| 1998 | −37.9% |
| 2002 | +10.4% |
| 2004 | −42.3% |
| 2008 | +25.4% |
| 2010 | −31.1% |
| 2014 | −8.3% |
| 2016 | −24.5% |
| 2020 | −6.6% |
| 2022 | −12.2% |