# 1940 United States Senate election in Washington

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The 1940 United States Senate election in Washington was held on November 5, 1940. Incumbent Democrat Lewis Schwellenbach did not run for a second term in office. He was succeeded by Democratic U.S. Representative Monrad C. Wallgren, who defeated Republican Stephen Foster Chadwick for the open seat.

## Blanket primary
### Candidates
#### Democratic

* Frank T. Bell, former Commissioner of Fish and Fisheries, former Treasurer of Grant County, and businessman
* Harry C. Huse
* Donald B. Miller, State Representative, and businessman
* Roy B. Misener, King County Assessor
* Robert Lee Smith
* Monrad Wallgren, U.S. Representative from Everett

#### Republican

* Stephen Fowler Chadwick, son of Stephen J. Chadwick, and candidate for Representative from Washington in 1926
* Ewing D. Colvin, former Prosecutor of King County, and Washington State Bar Association official
* Howard E. Foster
* Eric Johnston, businessman, and former Marine
* Robert Prior

### Results

1940 U.S. Senate primary election in Washington :
| Party | Party | Candidate | Votes | % |
| | Republican | Stephen Foster Chadwick | 137,320 | 27.45% |
| | Democratic | Monrad Wallgren | 96,747 | 19.34% |
| | Democratic | Frank T. Bell | 51,510 | 10.30% |
| | Democratic | Harry C. Huse | 50,930 | 10.18% |
| | Republican | Eric Johnston | 42,542 | 8.51% |
| | Democratic | Roy B. Misener | 41,259 | 8.25% |
| | Republican | Ewing D. Colvin | 27,903 | 5.58% |
| | Republican | Robert Prior | 19,194 | 3.84% |
| | Democratic | Robert Lee Smith | 13,918 | 2.78% |
| | Democratic | Donald B. Miller | 11,904 | 2.38% |
| | Republican | Howard E. Foster | 6,954 | 1.39% |
| Total votes | Total votes | Total votes | 500,181 | 100.00% |

## General election
### Results

1940 U.S. Senate election in Washington :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Monrad Wallgren | 404,718 | 54.16% | 6.77 |
| | Republican | Stephen Fowler Chadwick | 342,589 | 45.84% | 11.82 |
| Total votes | Total votes | Total votes | 747,307 | 100.00% | |
| | Democratic hold | Democratic hold | Swing | | |