# 1930 United States Senate election in South Dakota

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The 1930 United States Senate election in South Dakota took place on November 4, 1930. Incumbent Republican Senator William H. McMaster ran for re-election to a second term. After beating back a challenge in the Republican primary from former State Senator George J. Danforth, McMaster faced Democratic nominee William J. Bulow, the incumbent Governor, in the general election. As the Democratic Party performed well nationwide, Bulow narrowly defeated McMaster.

## Democratic primary
### Candidates

* William J. Bulow, Governor of South Dakota
* James McNamara, former State Senator from Beadle County

### Results

Democratic primary :
| Party | Party | Candidate | Votes | % |
| | Democratic | William J. Bulow | 16,520 | 73.88% |
| | Democratic | James McNamara | 5,840 | 26.12% |
| Total votes | Total votes | Total votes | 22,360 | 100.00% |

## Republican primary
### Candidates

* William H. McMaster, incumbent U.S. Senator
* George J. Danforth, former State Senator from Minnehaha County

### Results

Republican primary :
| Party | Party | Candidate | Votes | % |
| | Republican | William H. McMaster (inc.) | 64,331 | 55.92% |
| | Republican | George J. Danforth | 50,717 | 44.08% |
| Total votes | Total votes | Total votes | 115,048 | 100.00% |

## General election
### Results

1930 United States Senate election in South Dakota :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | William J. Bulow | 106,317 | 51.63% | +20.39% |
| | Republican | William H. McMaster (inc.) | 99,595 | 48.37% | +4.24% |
| Majority | Majority | Majority | 6,722 | 3.26% | −9.62% |
| Turnout | Turnout | Turnout | 205,912 | | |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |