# 1928 United States Senate election in Wisconsin

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vte :
The 1928 United States Senate election in Wisconsin was held on November 6, 1928.
Incumbent Republican U.S. Senator Robert La Follette Jr., who had won a special election to finish his late father's term in 1925, was elected to a full term in office.
La Follette had to fend off two challenges from his own party, defeating George W. Mead in the party primary and Republican State Senator William H. Markham in the general election. Markham ran as a pro-Hoover "Regular Republican."

## Republican primary
### Candidates

* Robert M. La Follette Jr., incumbent Senator since 1925
* George W. Mead

### Results

1928 Republican U.S. Senate primary :
| Party | Party | Candidate | Votes | % |
| | Republican | Robert M. La Follette Jr. (incumbent) | 322,979 | 66.71% |
| | Republican | George W. Mead | 161,156 | 33.29% |
| Total votes | Total votes | Total votes | 484,135 | 100.00% |

## Democratic primary
### Candidates

* Michael K. Reilly, former U.S. representative (1913–1917)

### Results

1928 Democratic U.S. Senate primary :
| Party | Party | Candidate | Votes | % |
| | Democratic | Michael K. Reilly | 38,432 | 100.00% |
| Total votes | Total votes | Total votes | 38,432 | 100.00% |

## Prohibition primary
### Candidates

* David W. Emerson

### Results

1928 Prohibition U.S. Senate primary :
| Party | Party | Candidate | Votes | % |
| | Prohibition | David W. Emerson | 827 | 100.00% |
| Total votes | Total votes | Total votes | 827 | 100.00% |

## General election
### Candidates

* David W. Emerson (Prohibition)
* John Kasun (Workers)
* Richard Koeppel (Labor)
* Robert M. La Follette Jr., incumbent Senator since 1925 (Republican)
* William H. Markham, State Senator from Horicon (Independent Republican)
* Michael K. Reilly (Democratic) (withdrew)

### Campaign

The Democratic Party of Wisconsin decided to endorse the progressive La Follette after he won the Republican primary. The Democrats asked their own nominee, Michael K. Reilly, to withdraw from the race; he agreed, announcing his decision on October 8. This was part of a broader attempt at a coalition between progressives and Democrats in Wisconsin to throw the state to Democrat Al Smith in the concurrent presidential election.

### Results

1928 U.S. Senate election in Wisconsin :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Robert La Follette Jr. (incumbent) | 635,376 | 85.57% | 19.06 |
| | Independent Republican | William H. Markham | 81,302 | 10.95% | 14.98 |
| | Prohibition | David W. Emerson | 21,359 | 2.88% | N/A |
| | Socialist Labor | Richard Koeppel | 3,053 | 0.41% | 0.18 |
| | Communist | John Kasun | 1,463 | 0.20% | N/A |
| | Write-in | Write-in | 92 | 100.00% | {{{change}}} |
| Total votes | Total votes | Total votes | 742,645 | 100.00% |
| | Republican hold | Republican hold | Republican hold | Republican hold | Republican hold |