| Year | Age | State | Party | Office | District | Stage | Pos | Votes | % |
|---|---|---|---|---|---|---|---|---|---|
| 1976 | 21 | MT | D | State House | District 083 | General | 1 | 2,992 | 100.0% |
| 1978 | 23 | MT | D | State House | District 083 | General | 1 | 2,642 | 100.0% |
| 1988 | 33 | MT | D | Secretary of State | Primary | 1 | 92,108 | 100.0% | |
| 1988 | 33 | MT | D | Secretary of State | General | 1 | 174,917 | 49.3% | |
| 1992 | 37 | MT | D | Secretary of State | Primary | 1 | 106,591 | 100.0% | |
| 1992 | 37 | MT | D | Secretary of State | General | 1 | 249,359 | 64.0% | |
| 1996 | 41 | MT | D | Secretary of State | Primary | 1 | 83,977 | 100.0% | |
| 1996 | 41 | MT | D | Secretary of State | General | 1 | 309,503 | 84.0% | |
| 2000 | 45 | MT | D | Governor | Primary | 3 | 15,677 | 16.3% | |
| 2002 | 47 | MT | D | State Senate | District 026 | General | 1 | 5,314 | 68.1% |
| 2006 | 51 | MT | D | State Senate | District 040 | Primary | 1 | 2,726 | 100.0% |
| 2006 | 51 | MT | D | State Senate | District 040 | General | 1 | 5,871 | 68.2% |
| 2016 | 61 | MT | D | Lt. Governor | Primary | 1 | 0 | 0.0% | |
| 2016 | 61 | MT | D | Lt. Governor | General | 1 | 0 | 0.0% | |
| 2020 | 65 | MT | D | Governor | Primary | 1 | 81,527 | 54.9% | |
| 2020 | 65 | MT | D | Governor | General | 2 | 250,860 | 41.6% | |
|
Age: Age as of July 1 of the year pertaining to this election. |