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United States · Election results history · 1958 Senate · Montana
Election 1958 Results

Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.

1958 US Senate election in Montana

Mike Mansfield (Democrat) beat Lou W. Welch (Republican) in Montana in 1958, 76.2% to 23.8%, a margin of 52.4 points and 120,337 votes.

The Democratic hold continued from 1952, when Mike Mansfield also won.

Democrats led in 56 of the 56 counties as they stood then. The largest, Yellowstone, cast 21,878 votes and went to the Democrat by 35.9 points. The closest was Golden Valley, where 179 votes separated the two parties.

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Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.

Senate

CandidatePartyVotesShare
Mike Mansfield won Democratic 174,910 76.2%
Lou W. Welch Republican 54,573 23.8%
Total229,483

Every county

CountyDemocratRepublicanOthersTotalMargin
Yellowstone 14,863 67.9% 7,015 32.1% 21,878 D+35.9
Cascade 16,132 81.0% 3,776 19.0% 19,908 D+62.1
Silver Bow 15,805 84.7% 2,852 15.3% 18,657 D+69.4
Missoula 11,727 79.2% 3,072 20.8% 14,799 D+58.5
Flathead 9,191 77.9% 2,612 22.1% 11,803 D+55.7
Lewis And Clark 8,047 75.2% 2,653 24.8% 10,700 D+50.4
Gallatin 5,560 67.8% 2,643 32.2% 8,203 D+35.6
Deer Lodge 6,125 87.1% 910 12.9% 7,035 D+74.1
Fergus 4,439 76.9% 1,333 23.1% 5,772 D+53.8
Hill 4,283 80.2% 1,055 19.8% 5,338 D+60.5
Park 3,458 71.9% 1,350 28.1% 4,808 D+43.8
Lake 3,244 68.8% 1,471 31.2% 4,715 D+37.6
Ravalli 3,423 74.1% 1,199 25.9% 4,622 D+48.1
Custer 3,410 75.0% 1,137 25.0% 4,547 D+50.0
Valley 3,249 81.8% 725 18.2% 3,974 D+63.5
Dawson 2,759 73.3% 1,007 26.7% 3,766 D+46.5
Richland 2,812 75.4% 919 24.6% 3,731 D+50.7
Roosevelt 2,905 78.1% 813 21.9% 3,718 D+56.3
Lincoln 3,031 83.0% 620 17.0% 3,651 D+66.0
Carbon 2,503 69.7% 1,087 30.3% 3,590 D+39.4
Glacier 2,381 75.6% 768 24.4% 3,149 D+51.2
Chouteau 2,505 79.6% 642 20.4% 3,147 D+59.2
Teton 2,107 72.4% 802 27.6% 2,909 D+44.9
Powell 2,365 82.5% 502 17.5% 2,867 D+65.0
Phillips 2,186 76.4% 677 23.6% 2,863 D+52.7
Sanders 2,245 79.8% 569 20.2% 2,814 D+59.6
Toole 2,133 76.6% 651 23.4% 2,784 D+53.2
Beaverhead 2,086 76.4% 646 23.6% 2,732 D+52.7
Pondera 2,150 80.4% 523 19.6% 2,673 D+60.9
Sheridan 2,236 84.6% 408 15.4% 2,644 D+69.1
Big Horn 1,672 65.8% 868 34.2% 2,540 D+31.7
Blaine 1,962 77.4% 574 22.6% 2,536 D+54.7
Stillwater 1,554 65.3% 825 34.7% 2,379 D+30.6
Madison 1,739 73.1% 639 26.9% 2,378 D+46.3
Rosebud 1,523 69.2% 678 30.8% 2,201 D+38.4
Musselshell 1,548 77.1% 461 22.9% 2,009 D+54.1
Daniels 1,302 74.9% 436 25.1% 1,738 D+49.8
Fallon 1,038 69.2% 463 30.8% 1,501 D+38.3
Jefferson 1,185 79.5% 305 20.5% 1,490 D+59.1
Judith Basin 1,137 77.5% 330 22.5% 1,467 D+55.0
McCone 1,087 77.4% 318 22.6% 1,405 D+54.7
Sweet Grass 800 58.1% 577 41.9% 1,377 D+16.2
Wheatland 906 68.0% 427 32.0% 1,333 D+35.9
Granite 979 73.6% 351 26.4% 1,330 D+47.2
Broadwater 897 72.5% 341 27.5% 1,238 D+44.9
Mineral 869 82.8% 180 17.2% 1,049 D+65.7
Powder River 652 64.6% 357 35.4% 1,009 D+29.2
Liberty 740 77.2% 218 22.8% 958 D+54.5
Carter 631 68.9% 285 31.1% 916 D+37.8
Meagher 553 62.5% 332 37.5% 885 D+25.0
Prairie 576 65.2% 307 34.8% 883 D+30.5
Garfield 580 75.4% 189 24.6% 769 D+50.8
Wibaux 516 70.4% 217 29.6% 733 D+40.8
Golden Valley 378 65.5% 199 34.5% 577 D+31.0
Treasure 411 72.7% 154 27.3% 565 D+45.5
Petroleum 315 75.0% 105 25.0% 420 D+50.0

Counties as they stood in 1958; some have since been split, merged or renamed. Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Montana Senate elections we hold

YearWinnerMargin
2024 Tim Sheehy (R) R+7.1
2020 Steve Daines (R) R+10.0
2018 Jon Tester (D) D+3.6
2014 Steve Daines (R) R+17.7
2012 Jon Tester (D) D+3.7
2008 Max Baucus (D) D+45.8
2006 Jon Tester (D) D+0.9
2002 Max Baucus (D) D+31.0
2000 Conrad Burns (R) R+3.3
1996 Max Baucus (D) D+4.9
1994 Conrad R. Burns (R) R+24.7
1990 Max Baucus (D) D+38.7
1988 Conrad Burns (R) R+3.7
1984 Max Baucus (D) D+16.2
1982 John Melcher (D) D+12.8
1978 Max Baucus (D) D+11.4
1976 John Melcher (D) D+28.3
1972 Lee Metcalf (D) D+3.9
1970 Mike Mansfield (D) D+21.1
1966 Lee Metcalf (D) D+6.3
1964 Mike Mansfield (D) D+29.0
1960 Lee Metcalf (D) D+1.5
1958 Mike Mansfield (D) D+52.4
1954 James E. Murray (D) D+0.8
1952 Mike Mansfield (D) D+2.2
1948 James E. Murray (D) D+13.9
1946 Zales N. Ecton (R) R+8.1
1942 James E. Murray (D) D+0.7
1940 Burton K. Wheeler (D) D+46.9
1936 James E. Murray (D) D+27.9
1934 Burton K. Wheeler (D) D+41.4
1930 Thomas J. Walsh (D) D+22.5
1928 Burton K. Wheeler (D) D+6.4
1924 Thomas J. Walsh (D) D+10.4
1922 Burton K. Wheeler (D) D+11.8
1918 Thomas J. Walsh (D) D+5.3
1916 Henry L. Myers (D) D+7.7