1964 United States Senate election in Washington
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The 1964 United States Senate election in Washington was held on November 3, 1964. Incumbent Democrat Henry M. Jackson won a third term in office with a landslide victory over Republican Superintendent of Instruction Lloyd J. Andrews.
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November 3, 1964
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 County results Jackson: 50–60% 60–70% 70–80% 80–90% | |||||||||||||||||
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Blanket primary
Candidates
Democratic
- Alice Franklin Bryant
- Arthur C. DeWitt
- Henry M. Jackson, incumbent United States Senator since 1953
Republican
- Lloyd J. Andrews, State Superintendent of Public Instruction
- David J. Williams
- Mary Elizabeth Whitner
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Henry M. Jackson (incumbent) | 478,892 | 60.14% | |
| Republican | Lloyd J. Andrews | 216,616 | 27.23% | |
| Republican | David J. Williams | 37,450 | 4.71% | |
| Democratic | Alice Franklin Bryant | 29,052 | 3.65% | |
| Democratic | Arthur C. DeWitt | 20,709 | 2.6% | |
| Republican | Mary Elizabeth Whitner | 12,704 | 1.6% | |
| Total votes | 903,397 | 100.00% | ||
General election
Results
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Henry M. Jackson (incumbent) | 875,950 | 72.21% |  5.11 | |
| Republican | Lloyd J. Andrews | 337,138 | 27.79% |  3.59 | |
| Total votes | 1,213,088 | 100.00% | |||
| Democratic hold | Swing | ||||