1978Final results
1978 election for Illinois Representative District 42
Illinois House of Representatives · Illinois
3 seats: Harry D. Leinenweber (R), Jack Davis (R), Leroy Vanduyne (D) won.
3 seatsHarry D. LeinenweberRepublican · winner · incumbent
28.4%50,539
Jack DavisRepublican · winner · incumbent
26.9%47,873
Leroy VanduyneDemocrat · winner · incumbent
25.4%45,105
Joseph R. TriznaDemocrat
19.3%34,312
177,829 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 1978
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET