1978Final results
1978 election for Wisconsin's 1st District
U.S. House · Wisconsin
Leslie Aspin (D) won with 54.5% of the vote, defeating William Watson Petrie III (R) by 9.0 points.
Leslie AspinDemocrat · winner
54.5%77,146
William Watson Petrie IIIRepublican
45.5%64,437
141,585 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