1990Final results

1990 election for U.S. Senate in Iowa

Name: 1990 election for U.S. Senate in Iowa
Start: 1990-11-06
Location: Iowa

U.S. Senate · Iowa

Tom Harkin (D) won with 54.5% of the vote, defeating Thomas Tauke (R) by 9.1 points.

Tom HarkinDemocrat · winner

54.5%535,975

45.4%446,869

983,933 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

Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET

Each line compares the two campaigns on one scale.

Tom HarkinThomas Tauke

$5M

Raised by the campaign

$4.9M

$5.3M

Spent by the campaign

$5.1M

$59.7K

Cash on hand

$5K

Campaign money: FEC, through Dec 31, 1990.

Source: FEC campaign filingsUpdated Dec 31, 1990