1998 United States Senate election in Iowa
{{Short description|none}}
{{Use mdy dates|date=September 2023}}
{{Infobox election
| election_name = 1998 United States Senate election in Iowa
| country = Iowa
| flag_image = Flag of Iowa (xrmap collection).svg
| type = presidential
| ongoing = no
| previous_election = 1992 United States Senate election in Iowa
| previous_year = 1992
| next_election = 2004 United States Senate election in Iowa
| next_year = 2004
| election_date = November 3, 1998
| image_size = x150px
| image1 = Chuck Grassley official photo.jpg
| nominee1 = Chuck Grassley
| party1 = Republican Party (United States)
| popular_vote1 = 648,480
| percentage1 = 68.41%
| image2 = David Osterberg.jpg
| nominee2 = David Osterberg
| party2 = Democratic Party (United States)
| popular_vote2 = 289,049
| percentage2 = 30.49%
| map_image = 1998 United States Senate election in Iowa results map by county.svg
| map_size = 240px
| map_caption = County results
Grassley: {{legend0|#e27f7f|50-60%}} {{legend0|#d75d5d|60-70%}} {{legend0|#d72f30|70-80%}} {{legend0|#c21b18|80-90%}} {{legend0|#a80000|>90%}}
| title = U.S. Senator
| before_election = Chuck Grassley
| before_party = Republican Party (United States)
| after_election = Chuck Grassley
| after_party = Republican Party (United States)
}}
{{ElectionsIA}}
The 1998 United States Senate election in Iowa was held November 3, 1998. Incumbent Republican United States Senator Chuck Grassley sought re-election to a fourth term in the United States Senate, running against former State Representative David Osterberg, who won the Democratic nomination unopposed. Grassley had not faced a competitive election since 1980; this year proved no different, and Grassley defeated Osterberg in a landslide.
Democratic primary
= Candidates =
- David Osterberg, former State Representative
= Results =
{{Election box begin no change
| title = Democratic primary results{{cite web|url=http://sos.iowa.gov/elections/pdf/results/90s/1998primcanv.pdf |title=Results |date=1998 |website=sos.iowa.gov |format=PDF |access-date=2019-10-15}}
}}
{{Election box winning candidate with party link no change
| candidate = David Osterberg
| party = Democratic Party (United States)
| votes = 86,064
| percentage = 99.45%
}}
{{Election box candidate with party link no change
| candidate = Write-ins
| party = Democratic Party (United States)
| votes = 476
| percentage = 0.55%
}}
{{Election box total no change
| votes = 86,540
| percentage = 100.00%
}}
{{Election box end}}
Republican primary
= Candidates =
- Chuck Grassley, incumbent United States Senator
= Results =
{{Election box begin no change
| title = Republican primary results}}
{{Election box winning candidate with party link no change
| candidate = Chuck Grassley (Incumbent)
| party = Republican Party (United States)
| votes = 149,943
| percentage = 99.72%
}}
{{Election box candidate with party link no change
| candidate = Write-ins
| party = Republican Party (United States)
| votes = 419
| percentage = 0.28%
}}
{{Election box total no change
| votes = 150,362
| percentage= 100.00%
}}
{{Election box end}}
General election
= Results =
{{Election box begin
| title =United States Senate election in Iowa, 1998{{cite web|url=http://clerk.house.gov/member_info/electionInfo/1998election.pdf |title=Election info |date=1998 |website=clerk.house.gov |format=PDF |access-date=2019-10-15}}
}}
{{Election box winning candidate with party link
| party = Republican Party (United States)
| candidate = Chuck Grassley (Incumbent)
| votes = 648,480
| percentage = 68.41%
| change = -1.20%
}}
{{Election box candidate with party link
| party = Democratic Party (United States)
| candidate = David Osterberg
| votes = 289,049
| percentage = 30.49%
| change = +3.29%
}}
{{Election box candidate with party link
| party = Natural Law Party
| candidate = Susan Marcus
| votes = 7,561
| percentage = 0.80%
| change = -0.47%
}}
{{Election box candidate with party link
| party = Socialist Workers Party (United States)
| candidate = Margaret Trowe
| votes = 2,542
| percentage = 0.27%
| change = +0.16%
}}
{{Election box candidate
| party = Write-ins
| candidate =
| votes = 275
| percentage = 0.03%
| change =
}}
{{Election box majority
| votes = 359,431
| percentage = 37.92%
| change = -4.50%
}}
{{Election box turnout
| votes = 947,907
| percentage =
| change =
}}
{{Election box hold with party link
| winner = Republican Party (United States)
| loser = Democratic Party (United States)
| swing =
}}
{{Election box end}}