1990Final results
1990 election for Illinois's 6th District
U.S. House · Illinois
Henry Hyde (R) won with 66.7% of the vote, defeating Robert J. Cassidy (D) by 33.4 points.
Henry HydeRepublican · winner
66.7%96,410
Robert J. CassidyDemocrat
33.3%48,155
144,565 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 1990
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Robert J. CassidyHenry Hyde
$1.5K
Raised by the campaign
$302.5K
$1.1K
Spent by the campaign
$270.4K
$503
Cash on hand
$187.8K
Campaign money: FEC, through Dec 31, 1990.
Source: FEC campaign filingsUpdated Dec 31, 1990