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| Turnout | 73.54% | |||
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Elections were held inIllinois on Tuesday, November 8, 1966.[1]
Primaries were held on June 14, 1966.[1]
1966 was amidterm election year in the United States.
Turnout in the primary was 32.20%, with 1,791,494 ballots cast (1,060,189 Democratic and 731,305 Republican).[1][2][3]
Turnout in the general election was 73.54%, with 3,928,478 ballots cast.[1][3]
Incumbent SenatorPaul Douglas, a Democrat seeking a fourth term, was defeated by RepublicanCharles H. Percy.
All 24 Illinois seats in theUnited States House of Representatives were up for election in 1966.
Republicans flipped one seat, leaving the Illinois House delegation to consist of 12 Democrats and 12 Republicans.
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| Turnout | 70.01%[1][3] | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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County results Stevenson: 50–60% 60–70% Rowe: 50–60% 60–70% 70–80% | |||||||||||||||||
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IncumbentTreasurer wasWilliam J. Scott, a Republican. DemocratAdlai Stevenson III was elected to succeed him in office.
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Adlai E. Stevenson III | 782,650 | 100 | |
| Total votes | 782,650 | 100 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Harris Rowe | 552,553 | 100 | |
| Total votes | 552,553 | 100 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Adlai Stevenson III | 1,889,595 | 50.53 | |
| Republican | Harris Rowe | 1,849,940 | 49.47 | |
| Write-in | Robert V. Sabonjian | 124 | 0.00 | |
| Write-in | Others | 41 | 0.00 | |
| Total votes | 3,739,700 | 100 | ||
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| Turnout | 69.24%[1][3] | ||||||||||||||||
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County results Page: 50–60% 60–70% 70–80% Prince: 50–60% | |||||||||||||||||
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IncumbentSuperintendent of Public InstructionRay Page, a Republican, won a second term.
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Don M. Prince | 664,289 | 100 | |
| Write-in | Others | 3 | 0.0 | |
| Total votes | 664,289 | 100 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Ray Page (incumbent) | 445,691 | 74.71 | |
| Republican | Robert A. Campbell | 150,896 | 25.29 | |
| Total votes | 596,587 | 100 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Ray Page (incumbent) | 1,999,279 | 54.05 | |
| Democratic | Don M. Prince | 1,699,367 | 45.95 | |
| Write-in | Others | 5 | 0.00 | |
| Total votes | 3,698,651 | 100 | ||
Seats in theIllinois Senate were up for election in 1966. Republicans retained control of the chamber.
Seats in theIllinois House of Representatives were up for election in 1966. Republicans flipped control of the chamber.
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An election was held for three of nine seats for Trustees ofUniversity of Illinois.
The election saw the election of new Republican members Donald R. Grimes, Ralph Crane Hahn, and James A. Weatherly.[1][4]
Third-term incumbent Democrats Kenney E. Williamson and Frances Best Watkins lost reelection.[1][4] Incumbent third-term Republican Wayne A. Johnston Sr. was not renominated.[1][4]
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Donald R. Grimes | 1,983,311 | 18.35 | |
| Republican | Ralph C. Hahn | 1,960,089.5 | 18.13 | |
| Republican | James A. Weatherly | 1,922,462 | 17.78 | |
| Democratic | Frances Best Watkins (incumbent) | 1,678,404.5 | 15.53 | |
| Democratic | Kenney E. Williamson (incumbent) | 1,634,341 | 15.12 | |
| Democratic | Richard O. Hart | 1,632,172 | 15.10 | |
| Total votes | 10,810,780 | 100 | ||
Three ballot measures were put before voters in 1966. One was alegislatively referred state statute, and two werelegislatively referred constitutional amendments.
In order to be approved, legislatively referred state statutes required the support of a majority of those voting on the amendment.[1] In order to be placed on the ballot, proposed legislatively referred constitutional amendments needed to be approved by two-thirds of each house of theIllinois General Assembly.[5] In order to be approved, they required approval of either two-thirds of those voting on the amendment itself or a majority of all ballots cast in the general elections.[1]
The County Officers' Re-Election Amendment, a legislatively referred constitutional amendment, was put to a vote. It would have amended Section 8 of Article X of the Illinois Constitution. It failed to meet either threshold for passage.[1]
| County Officers' Re-Election Amendment[1][3] | |||
|---|---|---|---|
| Option | Votes | % of votes on referendum | % of all ballots cast |
| Yes | 1,808,491 | 59.18 | 46.04 |
| No | 1,247,248 | 40.82 | 31.75 |
| Total votes | 3,055,739 | 100 | 77.78 |
| Voter turnout | 57.21% | ||

General Banking Law Amendment was approved by voters as a legislatively referred state statute. It modified the state's banking law.[6] To pass, it had required a majority of those voting on the article to approve it.[1]
| Candidate | Votes | % | |
|---|---|---|---|
| Yes | 1,564,746 | 65.84 | |
| No | 811,981 | 34.16 | |
| Total votes | 2,376,727 | 100 | |
| Turnout | {{{votes}}} | 44.49% | |

The Revenue Amendment, a legislatively referred constitutional amendment, was put to a vote. It would have amended Sections 1, 2, 3, 9, 10, 12, and 13 of Article IX of the Illinois Constitution. It failed to meet either threshold for passage.[1]
| Revenue Amendment[1][3] | |||
|---|---|---|---|
| Option | Votes | % of votes on referendum | % of all ballots cast |
| Yes | 1,642,549 | 53.38 | 41.81 |
| No | 1,434,330 | 46.62 | 36.51 |
| Total votes | 3,076,879 | 100 | 78.32 |
| Voter turnout | 57.60% | ||

Local elections were held.