# 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.
As of 2024, 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

1928 Democratic Senate primary$^{:12}$ :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence C. Dill (incumbent) | 20,123 | 80.63% |
| | Democratic | James C. Longstreet | 4,833 | 19.37% |
| Total votes | Total votes | 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 (1911–23)

### Results

1928 Republican Senate primary$^{:3}$ :
| Party | 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 | Total votes | Total votes | 248,657 | 100.00% |

## General election
### Results

1928 U.S. Senate election in Washington :
| Party | 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 | Total votes | Total votes | 496,688 | 100.00% | |
| | Democratic hold | Democratic hold | Swing | | |