| Year | Age | State | Party | Office | District | Stage | Pos | Votes | % |
|---|---|---|---|---|---|---|---|---|---|
| 1986 | IA | D | Commissioner of Agriculture | Primary | 1 | 40,450 | 35.5% | ||
| 1986 | IA | D | Commissioner of Agriculture | General | 1 | 440,409 | 53.0% | ||
| 1990 | IA | D | Commissioner of Agriculture | Primary | 1 | 144,100 | 99.8% | ||
| 1990 | IA | D | Commissioner of Agriculture | General | 1 | 510,082 | 57.0% | ||
| 1994 | IA | D | Commissioner of Agriculture | Primary | 1 | 101,950 | 99.8% | ||
| 1994 | IA | D | Commissioner of Agriculture | General | 1 | 491,342 | 52.6% | ||
|
Age: Age as of July 1 of the year pertaining to this election. |