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1986 United States Senate election in Iowa 
Summary
The 1986 United States Senate election in Iowa was held November 4, 1986. Incumbent Republican United States Senator Chuck Grassley won re-election to a second term, defeating Democratic nominee, attorney John P. Roehrick in a landslide. This would be the last time that Grassley lost a county until 2010 when Roxanne Conlin flipped Johnson County.
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 County results Grassley: 50-60% 60-70% 70-80% 80–90% Roehrick: 40–50% | |||||||||||||||||
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Democratic primary edit
Candidates edit
- John P. Roehrick, attorney
- Juan Cortez
Results edit
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | John P. Roehrick | 88,347 | 83.83% | |
| Democratic | Juan Cortez | 16,987 | 16.12% | |
| Democratic | Write-ins | 60 | 0.06% | |
| Total votes | 105,394 | 100.00% | ||
Republican primary edit
Candidates edit
- Chuck Grassley, incumbent United States Senator
Results edit
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Chuck Grassley (Incumbent) | 108,370 | 99.96% | |
| Republican | Write-ins | 38 | 0.04% | |
| Total votes | 108,408 | 100.00% | ||
General election edit
Results edit
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Republican | Chuck Grassley (Incumbent) | 588,880 | 66.04% | +12.55% | |
| Democratic | John P. Roehrick | 299,406 | 33.57% | -11.97% | |
| Independent | John Masters | 3,370 | 0.38% | ||
| Write-ins | 106 | 0.01% | |||
| Majority | 289,474 | 32.46% | +24.51% | ||
| Turnout | 891,762 | ||||
| Republican hold | Swing | ||||