| Year | Age | State | Party | Office | District | Stage | Pos | Votes | % |
|---|---|---|---|---|---|---|---|---|---|
| 1978 | MT | D | U.S. Senate Class 2 | Primary | 3 | 18,184 | 13.6% | ||
| 1990 | MT | D | U.S. Senate Class 2 | Primary | 2 | 12,622 | 12.8% | ||
| 2000 | MT | D | U.S. Senate Class 1 | Primary | 2 | 30,242 | 33.8% | ||
| 2008 | MT | D | U.S. House | At-Large District | Primary | 1 | 70,176 | 49.2% | |
| 2008 | MT | D | U.S. House | At-Large District | General | 2 | 155,930 | 32.4% | |
| 2014 | MT | D | U.S. House | At-Large District | Primary | 2 | 28,580 | 40.2% | |
| 2020 | MT | R | U.S. Senate Class 2 | Primary | 2 | 13,944 | 6.4% | ||
| 2024 | MT | D | U.S. House | District 02 | Primary | 1 | 13,420 | 33.3% | |
| 2024 | MT | D | U.S. House | District 02 | General | 2 | 93,713 | 34.0% | |
|
Age: Age as of July 1 of the year pertaining to this election. |