South Dakota U.S. Senate election history

Every South Dakota U.S. Senate election from 1978 to 2022: winners, parties, margins and the seats that changed hands.

Current senators

South Dakota Senate races: Republican minus Democratic share, in points. Bars above the line lean Republican, below lean Democratic.

Year	Seat	Winner	Party	Runner-up	Margin	Votes
2022	Class III	John R. Thune	Republican	Brian L. Bengs	43.5	348,020
2020	Class II	M. Michael Rounds	Republican	Daniel P. Ahlers	31.5	420,219
2016	Class III	John R. Thune	Republican	Jay H. Williams	43.7	369,656
2014 flip	Class II	M. Michael Rounds	Republican	Richard P. Weiland	20.9	279,412
2010	Class III	John R. Thune	Republican	—	—	227,947
2008	Class II	Tim Johnson	Democratic	Joel D. Dykstra	25.0	380,673
2004 flip	Class III	John R. Thune	Republican	Tom Daschle	1.2	391,188
2002	Class II	Tim Johnson	Democratic	John R. Thune	0.2	337,501
1998	Class III	Tom Daschle	Democratic	Ron Schmidt	25.7	262,111
1996 flip	Class II	Tim Johnson	Democratic	Larry Pressler	2.6	324,487
1992	Class III	Tom Daschle	Democratic	Charlene Haar	32.4	334,495
1990	Class II	Larry Pressler	Republican	Ted Muenster	7.3	258,976
1986 flip	Class III	Tom Daschle	Democratic	Ellis James Abdnor	3.2	295,830
1984	Class II	Larry Pressler	Republican	George V. Cunningham	49.0	315,713
1980 flip	Class III	Ellis James Abdnor	Republican	George S. McGovern	18.8	327,478
1978 flip	Class II	Larry Pressler	Republican	Don Barnett	33.7	255,599

John R. Thune won in 2022 by 43.5 points.

Mike Rounds (Republican, term ends 2027) and John Thune (Republican, term ends 2029).

In 2008, when Tim Johnson won.

In 2022, when John R. Thune won.

Results: FiveThirtyEight (from 1976 for Senate, 1996 for governor). Current members: congress-legislators.