1986Flipped from RepublicanFinal results
1986 election for Missouri House District 140
Missouri House of Representatives · Missouri
Thomas M. Macdonnell (D) won with 51.5% of the vote, defeating John P. Thompson (R) by 3.1 points, a seat Republicans won last time.
Thomas M. MacdonnellDemocrat · winner
51.5%5,391
John P. ThompsonRepublican
48.5%5,069
10,460 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 1986
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET