# 1918 United States Senate election in Kansas

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The 1918 United States Senate election in Kansas was held on November 5, 1918. Incumbent Democratic Senator William H. Thompson ran for re-election to a second term in the first popular election for this seat after the ratification of the Seventeenth Amendment. Thompson was challenged by Governor Arthur Capper, the Republican nominee. Amid a nationwide Republican wave, Thompson lost to Capper in a landslide, winning just 34% of the vote to Capper's 64%.

## Democratic primary
### Candidates

* William H. Thompson, incumbent U.S. Senator
* George W. Marble, publisher of the Fort Scott Tribune-Monitor

### Results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | William H. Thompson (inc.) | 29,080 | 75.36% |
| | Democratic | George W. Marble | 9,510 | 24.64% |
| Total votes | Total votes | Total votes | 38,590 | 100.00% |

## Republican primary
### Candidates

* Arthur Capper, Governor of Kansas
* Walter R. Stubbs, former Governor of Kansas
* Charles F. Scott, U.S. Representative from Kansas's 2nd congressional district
* Joseph L. Bristow, former U.S. Senator

### Results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Arthur Capper | 103,120 | 59.45% |
| | Republican | Walter R. Stubbs | 31,614 | 18.22% |
| | Republican | Charles F. Scott | 24,826 | 14.31% |
| | Republican | Joseph L. Bristow | 13,911 | 8.02% |
| Total votes | Total votes | Total votes | 173,471 | 100.00% |

## Socialist primary
### Candidates

* Eva Harding, physician

### Results

Socialist primary results :
| Party | Party | Candidate | Votes | % |
| | Socialist | Eva Harding | 1,245 | 100.00% |
| Total votes | Total votes | Total votes | 1,245 | 100.00% |

## General election
### Results

1918 United States Senate election in Kansas :
| Party | Party | Candidate | Votes | % |
| | Republican | Arthur Capper | 281,931 | 63.69% |
| | Democratic | William H. Thompson (inc.) | 149,300 | 33.73% |
| | Socialist | Eva Harding | 11,429 | 2.58% |
| | Write-in | Write-in | 4 | 0.00% |
| Majority | Majority | Majority | 132,631 | 29.96% |
| Total votes | Total votes | Total votes | 442,664 | 100.00% |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |