# 1918 United States Senate election in Minnesota

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The 1918 United States Senate election in Minnesota took place on November 5, 1918. It was the first election for Minnesota's Class 2 seat in the United States Senate, and the second U.S. Senate election in Minnesota overall, held after the ratification of the Seventeenth Amendment to the United States Constitution, which established the popular election of United States Senators. Incumbent U.S. Senator Knute Nelson of the Republican Party of Minnesota easily defeated his challenger in the general election, Willis Greenleaf Calderwood of the National Party, to win a fourth term in the Senate.

## Republican primary
### Candidates
#### Declared

* Knute Nelson, Incumbent U.S. Senator since 1895
* James A. Peterson, Minneapolis attorney, former Hennepin County Attorney (1897–1899), former State Representative from the 42nd district (1901–1903), Republican candidate for U.S. Senate in 1912

### Results

Republican primary election results :
| Party | Party | Candidate | Votes | % |
| | Republican | Knute Nelson (Incumbent) | 229,923 | 71.99% |
| | Republican | James A. Peterson | 89,464 | 28.01% |
| Total votes | Total votes | Total votes | 319,387 | 100.00% |

## General election
### Candidates

* Willis G. Calderwood, state chair of the Prohibition Party, Prohibition nominee for state House District 30 in 1894, for state House District 39 in 1904, 1906, 1908, and 1910, for the at-large U.S. House seat in 1912, for Governor in 1914, and for the U.S. Senate in 1916; Farmer-Labor candidate for Lieutenant Governor in 1924

### Results

Special election results :
| Party | Party | Candidate | Votes | % |
| | Republican | Knute Nelson (Incumbent) | 206,428 | 60.05% |
| | National | Willis G. Calderwood | 137,334 | 39.95% |
| Total votes | Total votes | Total votes | 343,762 | 100.00% |
| Majority | Majority | Majority | 69,094 | 20.10% |
| | Republican hold | Republican hold | Republican hold | Republican hold |