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United States · Election results history · 1970 Senate · Delaware
Election 1970 Results

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1970 US Senate election in Delaware

William Roth (Republican) beat Jacob W. Zimmerman (Democrat) in Delaware in 1970, 58.8% to 40.1%, a margin of 18.7 points and 30,239 votes.

The Republican hold continued from 1964, when John J. Williams won.

Republicans led in 3 of the 3 counties as they stood then. The largest, New Castle, cast 114,429 votes and went to the Republican by 21.5 points. The closest was Kent, where 1,388 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
William Roth won Republican 94,979 58.8%
Jacob W. Zimmerman Democratic 64,740 40.1%
All other candidates 1,720 1.1%
Total161,439

Every county

CountyDemocratRepublicanOthersTotalMargin
New Castle 44,348 38.8% 68,915 60.2% 1,166 114,429 R+21.5
Sussex 10,945 41.2% 15,229 57.4% 364 26,538 R+16.1
Kent 9,447 46.1% 10,835 52.9% 190 20,472 R+6.8

Counties as they stood in 1970; 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.

Delaware Senate elections we hold

YearWinnerMargin
2024 Lisa Blunt Rochester (D) D+17.1
2020 Christopher A Coons (D) D+21.5
2018 Thomas R Carper (D) D+22.1
2014 Christopher A. Coons (D) D+13.6
2012 Thomas R. Carper (D) D+37.5
2008 Joseph R. Biden Jr. (D) D+29.4
2006 Tom Carper (D) D+39.7
2002 Joseph R. Biden Jr. (D) D+17.4
2000 Thomas R. Carper (D) D+11.8
1996 Joseph R. Biden Jr. (D) D+21.9
1994 William V. Roth, Jr. (R) R+13.3
1990 Joseph R. Biden Jr. (D) D+26.8
1988 William V. Roth, Jr. (R) R+24.1
1984 Joseph R. Biden Jr. (D) D+20.2
1982 William V. Roth, Jr. (R) R+11.0
1978 Joseph R. Biden Jr. (D) D+16.9
1976 William V. Roth, Jr. (R) R+12.2
1972 Joe Biden (D) D+1.4
1970 William Roth (R) R+18.7
1966 J. Caleb Boggs (R) R+18.2
1964 John J. Williams (R) R+3.5
1960 J. Caleb Boggs (R) R+1.4
1958 John Williams (R) R+6.6
1954 J. Allen Frear Jr. (D) D+13.9
1952 John J. Williams (R) R+9.0
1948 J. Allen Frear Jr. (D) D+2.6
1946 John J. Williams (R) R+10.3
1942 Clayton D. Buck (R) R+9.2
1940 James M. Tunnell (D) D+3.3
1936 James H. Hughes (D) D+11.6
1934 John G. Townsend Jr. (R) R+7.1
1930 Daniel O. Hastings (R) R+9.1
1928 John G. Townsend Jr. (R) R+21.9
1924 T.Coleman du Pont (R) R+18.7
1922 Thomas F. Bayard Jr. (D) D+0.4
1918 L. Heisler Ball (R) R+3.3
1916 Josiah O. Wolcott (D) D+4.9