1978Final results
1978 election for Illinois's 4th District
U.S. House · Illinois
Edward J. Derwinski (R) won with 66.9% of the vote, defeating Andrew Thomas (D) by 33.7 points.
Edward J. DerwinskiRepublican · winner
66.9%94,435
Andrew ThomasDemocrat
33.1%46,788
141,229 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 1978
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET