1972Final results
1972 election for Illinois Legislative District 40
Illinois State Senate · Illinois
Jack T. Knuepfer (R) won with 65.2% of the vote, defeating Robert H. Renshaw (D) by 30.5 points.
Jack T. KnuepferRepublican · winner · incumbent
65.2%49,346
Robert H. RenshawDemocrat
34.8%26,292
75,638 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 1972
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET