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| Turnout | 71.56% | ||||||||||||||||
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 County results Percy: 50-60% 60-70% 70-80% | |||||||||||||||||
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The1966 United States Senate election in Illinois took place on November 8, 1966.[1] IncumbentDemocraticUnited States SenatorPaul Douglas, seeking a fourth term in theUnited States Senate, faced off againstRepublicanCharles H. Percy, a businessman and the1964 Republican nominee forGovernor of Illinois. A competitive election ensued, featuring campaign appearances by formervice presidentRichard M. Nixon on behalf of Percy.[2] Ultimately, Percy ended up defeating Senator Douglas by a fairly wide margin, allowing him to win what would be the first of three terms in the Senate.
Theprimary (held on June 14) and general election coincided with those forHouse andstate elections.[1]
Turnout in the primaries was 27.13%, with 1,509,302 votes cast.[1][3]
Turnout during the general election was 71.56%, with a total of 3,822,724 votes cast.[1][3]
IncumbentPaul Douglas was renominated, running unopposed.
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Paul H. Douglas (incumbent) | 840,936 | 100 | |
| Write-in | 3 | 0.00 | ||
| Total votes | 840,939 | 100 | ||
BusinessmanCharles H. Percy won the Republican primary by a large margin.
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Charles H. Percy | 605,815 | 90.64 | |
| Republican | Howard J. Doyle | 38,636 | 5.78 | |
| Republican | Lar "America First" Daly | 23,889 | 3.57 | |
| Write-in | 23 | 0.00 | ||
| Total votes | 668,363 | 100 | ||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Republican | Charles H. Percy | 2,100,449 | 54.95% | +9.75% | |
| Democratic | Paul H. Douglas (incumbent) | 1,678,147 | 43.90% | −10.73% | |
| Write-in | Robert Sabonjian | 41,965 | 1.10% | ||
| Write-in | Maxwell Primack | 1,693 | 0.04% | ||
| Write-in | Others | 470 | 0.01% | ||
| Majority | 422,302 | 11.05% | +1.61% | ||
| Turnout | 3,822,724 | 71.56 | |||
| Republicangain fromDemocratic | Swing | ||||
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