| Year | Age | State | Party | Office | District | Stage | Pos | Votes | % |
|---|---|---|---|---|---|---|---|---|---|
| 1998 | IA | D | Secretary of State | District SOS | Primary | 1 | 66,865 | 66.9% | |
| 1998 | IA | D | Secretary of State | District SOS | General | 1 | 457,161 | 49.9% | |
| 2002 | IA | D | Secretary of State | District SOS | Primary | 1 | 76,559 | 99.8% | |
| 2002 | IA | D | Secretary of State | District SOS | General | 1 | 526,600 | 53.5% | |
| 2006 | IA | D | Governor | Primary | 1 | 58,131 | 39.1% | ||
| 2006 | IA | D | Governor | General | 1 | 569,021 | 54.0% | ||
| 2010 | IA | D | Governor | Primary | 1 | 56,293 | 100.0% | ||
| 2010 | IA | D | Governor | General | 2 | 484,798 | 43.2% | ||
|
Age: Age as of July 1 of the year pertaining to this election. |