December 10, 1957
Special Election
Special Election to fill the vacancy created by the resignation of Assemblyman Thomas W. Caldecott (AD-18). Caldecott resigned after being appointed to the Alameda County Superior Court.
| AD-18 | |||
| Winton McKibben | Democratic | 49.2% | Loss |
| Don Mulford | Republican | 50.8% | Win |
