# 1998 United States Senate election in Iowa

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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

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | David Osterberg | 86,064 | 99.45% |
| | Democratic | Write-ins | 476 | 0.55% |
| Total votes | Total votes | Total votes | 86,540 | 100.00% |

## Republican primary
### Candidates

* Chuck Grassley, incumbent United States Senator

### Results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Chuck Grassley (Incumbent) | 149,943 | 99.72% |
| | Republican | Write-ins | 419 | 0.28% |
| Total votes | Total votes | Total votes | 150,362 | 100.00% |

## General election
### Results

United States Senate election in Iowa, 1998 :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Chuck Grassley (Incumbent) | 648,480 | 68.41% | −1.20% |
| | Democratic | David Osterberg | 289,049 | 30.49% | +3.29% |
| | Natural Law | Susan Marcus | 7,561 | 0.80% | −0.47% |
| | Socialist Workers | Margaret Trowe | 2,542 | 0.27% | +0.16% |
| | Write-ins | | 275 | 0.03% | |
| Majority | Majority | Majority | 359,431 | 37.92% | −4.50% |
| Turnout | Turnout | Turnout | 947,907 | | |
| | Republican hold | Republican hold | Swing | | |