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1966 United States Senate election in Illinois

The 1966 United States Senate election in Illinois took place on November 8, 1966. Incumbent Democratic United States Senator Paul Douglas, seeking a fourth term in the United States Senate, faced off against Republican Charles H. Percy, a businessman and the 1964 Republican nominee for Governor of Illinois. A competitive election ensued, featuring campaign appearances by former vice president Richard M. Nixon on behalf of Percy. 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.

Background
The primary (held on June 14) and general election coincided with those for House and state elections. Turnout during the general election was 71.56%, with a total of 3,822,724 votes cast. ==Democratic primary==
Democratic primary
Incumbent Paul Douglas was renominated, running unopposed. CandidatesPaul Douglas, incumbent U.S. Senator Results ==Republican primary==
Republican primary
Businessman Charles H. Percy won the Republican primary by a large margin. Candidates • Howard J. Doyle • Charles H. Percy, businessman and 1964 Illinois gubernatorial nominee • Lar Daly, perennial candidate Results ==Write-in candidates==
Write-in candidates
• Maxwell Primack • Robert Sabonjian, Mayor of Waukegan ==General election==
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