1986Final results
1986 election for U.S. Senate in Iowa
U.S. Senate · Iowa
Chuck Grassley (R) won with 66.0% of the vote, defeating John O. Roehrick (D) by 32.5 points.
Chuck GrassleyRepublican · winner
66.0%588,880
John O. RoehrickDemocrat
33.6%299,406
John MastersIndependent
0.4%3,370
891,762 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 1986
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.
John O. RoehrickChuck Grassley
$256.1K
Raised by the campaign
$2.7M
$255.7K
Spent by the campaign
$2.5M
$384
Cash on hand
$486.4K
Campaign money: FEC, through Dec 31, 1986.
Source: FEC campaign filingsUpdated Dec 31, 1986