1984Flipped from RepublicanFinal results
1984 election for U.S. Senate in Iowa
U.S. Senate · Iowa
Tom Harkin (D) won with 55.5% of the vote, defeating Roger W. Jepsen (R) by 11.8 points, a seat Republicans won last time.
Tom HarkinDemocrat · winner
55.5%716,883
Roger W. JepsenRepublican
43.7%564,381
Garry De YoungIndependent
0.9%11,014
1,292,700 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 1984
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.
Tom HarkinRoger W. Jepsen
$2.8M
Raised by the campaign
$2.7M
$2.8M
Spent by the campaign
$2.9M
$5.1K
Cash on hand
$8K
Campaign money: FEC, through Dec 31, 1984.
Source: FEC campaign filingsUpdated Dec 31, 1984