| Year | Age | State | Party | Office | District | Stage | Pos | Votes | % |
|---|---|---|---|---|---|---|---|---|---|
| 1992 | IL | R | State Senate | District 021 | Primary | 1 | 10,278 | 38.5% | |
| 1992 | IL | R | State Senate | District 021 | General | 1 | 55,726 | 62.8% | |
| 1996 | IL | R | State Senate | District 021 | General | 1 | 53,084 | 65.1% | |
| 1998 | IL | R | Comptroller | Primary | 1 | 317,766 | 51.5% | ||
| 1998 | IL | R | Comptroller | General | 2 | 1,280,860 | 39.6% | ||
| 2000 | IL | R | State Senate | District 021 | Primary | 1 | 17,180 | 67.4% | |
| 2000 | IL | R | State Senate | District 021 | General | 1 | 64,672 | 64.9% | |
| 2002 | IL | R | State Senate | District 025 | Primary | 1 | 24,953 | 66.9% | |
| 2002 | IL | R | State Senate | District 025 | General | 1 | 64,310 | 100.0% | |
| 2006 | IL | R | State Senate | District 025 | Primary | 1 | 35,945 | 100.0% | |
| 2006 | IL | R | State Senate | District 025 | General | 1 | 56,976 | 65.0% | |
| 2008 | IL | R | U.S. House | District 14 | Primary | 2 | 32,584 | 41.3% | |
| 2008 | IL | R | U.S. House | District 14 | Special Primary | 2 | 32,955 | 44.0% | |
| 2010 | IL | R | State Senate | District 025 | Primary | 1 | 22,717 | 70.1% | |
| 2010 | IL | R | State Senate | District 025 | General | 1 | 70,842 | 69.3% | |
|
Age: Age as of July 1 of the year pertaining to this election. |