1998 United States Senate election in Iowa

none March 2026 September 2023 1998 United States Senate election in Iowa Iowa Flag of Iowa (xrmap collection).svg presidential no 1992 United States Senate election in Iowa 1992 2004 United States Senate election in Iowa 2004 November 3, 1998 150x150px Chuck Grassley official photo.jpg Chuck Grassley Republican Party (United States) 648,480 68.41% David Osterberg.jpg David Osterberg Democratic Party (United States) 289,049 30.49% 1998 United States Senate election in Iowa results map by county.svg 240px County results Grassley: #e27f7f 50–60% #d75d5d 60–70% #d72f30 70–80% #c21b18 80–90% #a80000 >90% U.S. Senator Chuck Grassley Republican Party (United States) Chuck Grassley Republican Party (United States) The 1998 United States Senate election in Iowa was held November 3, 1998. Republican incumbent Chuck Grassley was re-elected to a fourth term over Democratic former state representative David Osterberg in a landslide. Republican primary Candidates Chuck Grassley, incumbent U.S. senator since 1981 Results Republican primary results Chuck Grassley (Incumbent) Republican Party (United States) 149,943 99.72% Write-ins Republican Party (United States) 419 0.28% 150,362 100.00% Democratic primary Candidates David Osterberg, former state representative Results Democratic primary resultshttp://sos.iowa.gov/elections/pdf/results/90s/1998primcanv.pdf Results 1998 sos.iowa.gov PDF 2019-10-15 David Osterberg Democratic Party (United States) 86,064 99.45% Write-ins Democratic Party (United States) 476 0.55% 86,540 100.00% General election Candidates Chuck Grassley, incumbent U.S. senator since 1981 (Republican) Susan Marcus (Natural Law) David Osterberg, former state representative (Democratic) Margaret Trowe (Socialist Workers) Debate + 1998 Iowa United States Senate election debate No. Number Date Host Moderator Link Republican DemocraticKey:black #90ff90  P  Participant  black #FFFFDD  A  Absent  black #ff9090  N  Not invited  black #CCFFCC  I  Invited #f0e68c W Withdrawn Chuck Grassley David Osterberg1 Oct. 19, 1998 Iowa Public Television Dean Borg C-SPAN P P Polling Poll source Date(s)administered SamplesizeKey:A – all adultsRV – registered votersLV – likely votersV – unclear Marginof error ChuckGrassley (R) DavidOsterberg (D) Other / undecidedCalculated by taking the difference of 100% and all other candidates combined. pollingMason-Dixon Polling & StrategyFiveThirtyEight's Pollster Ratings Raw Polls File https://raw.githubusercontent.com/fivethirtyeight/data/refs/heads/master/pollster-ratings/2023/raw-polls.csv October 15, 2026 GitHub FiveThirtyEightCNN AllPolitics Election '98 - Iowa 1998 Polls https://www.cnn.com/ELECTION/1998/states/IA/polls/IA98S.html CNN 25 June 2025 https://archive.today/20250625210327/https://www.cnn.com/ELECTION/1998/states/IA/polls/IA98S.html 25 June 2025 liveOctober 25–27, 1998803 (LV)± 3.5%68%24%8%Mason-Dixon Polling & StrategyOctober 11–13, 1998809 (LV)± 3.5%67%22%11%Mason-Dixon Polling & StrategySeptember 12–14, 1998804 (LV)± 3.5%69%19%12%Mason-Dixon Polling & StrategyJuly 18–21, 1998834 (LV)± 3.5%68%17%15%Selzer & CompanyJune 20–24, 1998581 (LV)± 4.0%72%18%10% Results United States Senate election in Iowa, 1998http://clerk.house.gov/member_info/electionInfo/1998election.pdf Election info 1998 clerk.house.gov PDF 2019-10-15 Republican Party (United States) Chuck Grassley (Incumbent) 648,480 68.41% -1.20% Democratic Party (United States) David Osterberg 289,049 30.49% +3.29% Natural Law Party Susan Marcus 7,561 0.80% -0.47% Socialist Workers Party (United States) Margaret Trowe 2,542 0.27% +0.16% Write-ins 275 0.03% 359,431 37.92% -4.50% 947,907 Republican Party (United States) Democratic Party (United States) See also 1998 United States Senate elections Notes References United States Senate Iowa 1998