1928 United States Senate election in Washington
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The 1928 United States Senate election in Washington was held on November 6, 1928. Incumbent Democrat Clarence Dill was re-elected to a second term in office over Republican Chief justice Kenneth Mackintosh.
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November 6, 1928
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 County results Dill: 50â60% 60â70% 70â80% Mackintosh: 50â60% | |||||||||||||||||
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As of 2026, this is the last time Washington elected a U.S. Senator from east of the Cascade Mountains.
Democratic primary
Candidates
- Clarence C. Dill, incumbent Senator since 1923
- James Cleveland Longstreet
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Clarence C. Dill (incumbent) | 20,123 | 80.63% | |
| Democratic | James C. Longstreet | 4,833 | 19.37% | |
| Total votes | 24,956 | 100.00% | ||
Republican primary
Candidates
- Austin E. Griffiths
- Kenneth Mackintosh, Chief Justice of the Washington Supreme Court since 1918
- Miles Poindexter, U.S. Ambassador to Peru and former U.S. Senator (1911â23)
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Kenneth Mackintosh | 118,664 | 47.72% | |
| Republican | Miles Poindexter | 83,102 | 33.42% | |
| Republican | Austin E. Griffiths | 46,891 | 18.86% | |
| Total votes | 248,657 | 100.00% | ||
General election
Results
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Clarence C. Dill (incumbent) | 261,524 | 53.42% |  9.15 | |
| Republican | Kenneth Mackintosh | 227,415 | 46.45% | 3.52 | |
| Communist | Alex Noral | 666 | 0.14% |  0.02 | |
| Total votes | 496,688 | 100.00% | |||
| Democratic hold | Swing | ||||