December 10, 1974
Special Election
Special Election to fill the vacancy created by the resignation of State Senator John L. Harmer (SD-21). Harmer resigned after being appointed Lieutenant Governor.
| SD-21 | |||
| Jack E. Ashworth | American Independent | 0.5% | Loss |
| Newton R. Russell | Republican | 51.3% | Win |
| Arthur K. Snyder | Republican | 32.8% | Loss |
| John L. Sullivan | Republican | 3.3% | Loss |
| John G. Triphon | Democratic | 4.3% | Loss |
| Kent Leeds Vallette | Democratic | 4.4% | Loss |
| Alice Zuber | Democratic | 3.4% | Loss |