CNN projects Sen. John Thune will be the Republican nominee as he seeks a fourth term. Democrats did not have a primary. Military veteran and former college professor Brian Bengs is the Democratic nominee.

Senate: South Dakota Primary Results (R)

Candidate(s) % Votes
Thune Incumbent %
ahead
Whalen %
ahead
Mowry %
ahead

Senate: South Dakota Primary County Results (R)

Aurora

Candidate(s) % Votes
Mowry %
Thune Incumbent %
Whalen %

Beadle

Candidate(s) % Votes
Mowry %
Thune Incumbent %
Whalen %

Bennett

Candidate(s) % Votes
Mowry %
Thune Incumbent %
Whalen %

Bon Homme

Candidate(s) % Votes
Mowry %
Thune Incumbent %
Whalen %

Brookings

Candidate(s) % Votes
Thune Incumbent %
Whalen %
Mowry %

Brown

Candidate(s) % Votes
Thune Incumbent %
Whalen %
Mowry %

Brule

Candidate(s) % Votes
Mowry %
Thune Incumbent %
Whalen %

Buffalo

Candidate(s) % Votes
Mowry %
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