# 1918 United States Senate election in Illinois

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vte :
The 1918 United States Senate election in Illinois took place on November 5, 1918.
Incumbent Democrat J. Hamilton Lewis lost reelection to Republican Medill McCormick.
The primaries and general election coincided with those for House and those for state elections. The primaries were held September 11, 1918.
This was the first election for this U.S. Senate seat to be held after the Seventeenth Amendment to the United States Constitution went into effect, and was therefore the first time that this seat faced a popular election.

## Democratic primary
### Candidates

* James Hamilton Lewis, incumbent U.S. senator
* James O. Monroe, attorney and perennial candidate
* James Traynor

### Results

Democratic primary :
| Party | Party | Candidate | Votes | % |
| | Democratic | James Hamilton Lewis (incumbent) | 169,552 | 81.37 |
| | Democratic | James O. Monroe | 21,288 | 10.22 |
| | Democratic | James Traynor | 17,523 | 8.41 |
| Total votes | Total votes | Total votes | 208,363 | 100 |

## Republican primary
### Candidates

* Alfred E. Case
* George Edmund Foss, U.S. congressman
* Medill McCormick, U.S. congressman
* Patrick H. O'Donnell
* William Hale Thompson, mayor of Chicago

### Results

Republican primary :
| Party | Party | Candidate | Votes | % |
| | Republican | Medill McCormick | 192,222 | 44.04 |
| | Republican | William Hale Thompson | 169,552 | 38.85 |
| | Republican | George Edmund Foss | 62,040 | 14.22 |
| | Republican | Patrick H. O'Donnell | 7,535 | 1.73 |
| | Republican | Alfred E. Case | 5,075 | 1.16 |
| Total votes | Total votes | Total votes | 436,424 | 100 |

## Socialist primary
### Candidates

* William Bross Lloyd, attorney and activist

### Results

Socialist primary :
| Party | Party | Candidate | Votes | % |
| | Socialist | William Bross Lloyd | 1,801 | 100 |
| Total votes | Total votes | Total votes | 1,801 | 100 |

## General election
### Candidates

* John M. Francis (Socialist Labor)
* J. Hamilton Lewis (Democrat), incumbent U.S. senator
* William Bross Lloyd (Socialist), attorney and activist
* Medill McCormick (Republican), U.S. congressman
* Frank B. Vennum (Prohibition Party), activist, capitalist, philanthropist, and 1912 candidate for Illinois treasurer

### Results

1918 United States Senate election in Illinois :
| Party | Party | Candidate | Votes | % |
| | Republican | Medill McCormick | 479,967 | 50.50 |
| | Democratic | James Hamilton Lewis (incumbent) | 426,943 | 44.92 |
| | Socialist | William Bross Lloyd | 37,167 | 3.91 |
| | Socialist Labor | John M. Francis | 3,268 | 0.34 |
| | Prohibition | Frank B. Vennum | 3,151 | 0.33 |
| Majority | Majority | Majority | 53,024 | 5.58 |
| Turnout | Turnout | Turnout | 950,496 | |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |