Federal race · 2020
Iowa U.S. Senate, 2020
Primary: June 2, 2020 · General election: November 3, 2020
Money raised
- Theresa Greenfield (D)$56M raised · $30K on hand
- Joni K Ernst (R)$28M raised · $528K on hand
- Eddie J Mauro (D)$5.1M raised · $3K on hand
- Michael Franken (D)$982K raised · $0 on hand
- Kimberly Graham (D)$295K raised · $0 on hand
- Cal George Woods (D)$56K raised · −$2K on hand
- Suzanne Herzog (I)$18K raised · $0 on hand
- Rick Stewart (L)$9K raised · −$7K on hand
Raised Cash on hand · bars are blue for Democrats, red for Republicans, gray for others
Candidates
| Candidate | Status | Raised | Spent | Cash on hand | Through |
|---|---|---|---|---|---|
| Theresa Greenfield (D) | General-election nominee | $56,358,302.21 | $56,328,075.88 | $30,236.33 | 2020-12-31 |
| Joni K Ernst (R) | Won the general election (51.74%) | $27,693,029.26 | $28,527,764.02 | $528,414.93 | 2020-12-31 |
| Eddie J Mauro (D) | Lost primary | $5,067,232.85 | $5,063,937.70 | $3,295.15 | 2020-12-31 |
| Michael Franken (D) | Lost primary | $982,351.98 | $982,351.98 | $0.00 | 2020-09-08 |
| Kimberly Graham (D) | Lost primary | $294,725.45 | $296,301.53 | $0.00 | 2020-12-31 |
| Cal George Woods (D) | Withdrawn | $55,834.50 | $58,081.57 | −$2,310.07 | 2020-05-27 |
| Suzanne Herzog (I) | Running | $18,299.88 | $18,299.88 | $0.00 | 2020-12-31 |
| Rick Stewart (L) | General-election nominee | $8,820.00 | $16,092.83 | −$7,272.83 | 2020-12-31 |
Totals from the FEC candidate summary file, retrieved October 23, 2026. A dated snapshot, not live reporting; each candidate’s FEC page is the official source.
Total spent on this race
$261,201,364.39 = candidates’ own spending $87,385,463.43 + outside spending $173,815,900.96
| Candidate | Outside spending for | Against | Electioneering and member messages |
|---|---|---|---|
| Joni K Ernst | $10,549,178.01 | $81,296,785.60 | $1,071,495.40 |
| Theresa Greenfield | $23,412,248.06 | $56,297,439.45 | $861.02 |
| Michael Franken | $0.00 | $919,202.00 | $0.00 |
| Eddie J Mauro | $82,000.00 | $186,291.42 | $0.00 |
| Kimberly Graham | $400.00 | $0.00 | $0.00 |
Candidates’ own spending is their committees’ disbursements less transfers to other committees, contributions to others, loan repayments and refunds (FEC committee summary). Outside spending is independent expenditures, electioneering communications and company or union member communications for or against these candidates (FEC totals by candidate from regular reports, retrieved October 24, 2026; the latest 24- and 48-hour notices are not included yet). Party coordinated spending is not split by race and is not included. All the money
Polling and ratings
Race ratings
Recent polls
| Pollster | Dates | Sample | Margin of error | Results |
|---|---|---|---|---|
| Public Policy Polling (D) | November 1–2, 2020 | 871 (V) | – | Joni Ernst 47% · Theresa Greenfield 48% |
| Change Research (D) | October 29 – November 1, 2020 | 1,084 (LV) | ± 3.2% | Joni Ernst 47% · Theresa Greenfield 48% |
| Civiqs/Daily Kos | October 29 – November 1, 2020 | 853 (LV) | ± 3.7% | Joni Ernst 47% · Theresa Greenfield 50% |
| Data for Progress (D) | October 27 – November 1, 2020 | 951 (LV) | ± 3.2% | Joni Ernst 45% · Theresa Greenfield 49% |
| Emerson College | October 29–31, 2020 | 604 (LV) | ± 3.9% | Joni Ernst 48% · Theresa Greenfield 51% |
| InsiderAdvantage (R) | October 30, 2020 | 400 (LV) | ± 4.9% | Joni Ernst 51% · Theresa Greenfield 45% |
Ratings and polls as listed on Wikipedia: 2020 United States Senate election in Iowa (retrieved October 23, 2026), licensed CC BY-SA 4.0. TerraCivic does not rate races or compute its own average.
Results
| Candidate | Party | Votes | Share |
|---|---|---|---|
| Joni Ernst | Republican Party | 864,997 | 51.74% |
As listed on Wikipedia; official results come from the state election office.
TerraCivic shows public filings without scores, grades or judgments about any candidate.
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