| Year | Age | State | Party | Office | District | Stage | Pos | Votes | % |
|---|---|---|---|---|---|---|---|---|---|
| 1984 | IA | D | State House | District 081 | General | 1 | 6,798 | 52.8% | |
| 1986 | IA | D | State House | District 081 | General | 1 | 5,203 | 61.9% | |
| 1988 | IA | D | State House | District 081 | General | 1 | 7,035 | 59.1% | |
| 1990 | IA | D | State House | District 081 | General | 1 | 5,626 | 59.4% | |
| 1996 | IA | D | U.S. House | District 04 | Primary | 2 | 12,527 | 42.0% | |
| 2000 | IA | D | State House | District 068 | General | 1 | 7,431 | 90.0% | |
| 2006 | IA | D | State Senate | District 033 | General | 1 | 10,204 | 100.0% | |
| 2010 | IA | D | State Senate | District 033 | Primary | 1 | 1,545 | 100.0% | |
| 2010 | IA | D | State Senate | District 033 | General | 1 | 10,565 | 97.6% | |
| 2014 | IA | D | Governor | Primary | 1 | 60,385 | 99.2% | ||
| 2014 | IA | D | Governor | General | 2 | 421,625 | 37.3% | ||
|
Age: Age as of July 1 of the year pertaining to this election. |