United States Senate election in South Dakota, 2026 (June 2 Republican primary)

← 2022
U.S. Senate, South Dakota
Democratic primary Republican primary General election
Election details
Filing deadline: March 31, 2026
Primary: June 2, 2026 Primary runoff: July 28, 2026 General: November 5, 2024
How to vote
Poll times: 7 a.m. to 7 p.m. Voting in South Dakota
Race ratings
Cook Political Report: Solid Republican DDHQ and The Hill: Pending Inside Elections: Solid Republican Sabato's Crystal Ball: Safe Republican
Ballotpedia analysis
U.S. Senate battlegrounds U.S. House battlegrounds Federal and state primary competitiveness Ballotpedia's Election Analysis Hub, 2026
See also
U.S. Senate, South Dakota U.S. Senate • At-large South Dakota elections, 2026 U.S. Congress elections, 2026 U.S. Senate elections, 2026 U.S. House elections, 2026 Alabama U.S. Senate raceAlaska U.S. Senate raceArkansas U.S. Senate raceColorado U.S. Senate raceDelaware U.S. Senate raceGeorgia U.S. Senate raceIdaho U.S. Senate raceIllinois U.S. Senate raceIowa U.S. Senate raceKansas U.S. Senate raceKentucky U.S. Senate raceLouisiana U.S. Senate raceMaine U.S. Senate raceMassachusetts U.S. Senate raceMichigan U.S. Senate raceMinnesota U.S. Senate raceMississippi U.S. Senate raceMontana U.S. Senate raceNebraska U.S. Senate raceNew Hampshire U.S. Senate raceNew Jersey U.S. Senate raceNew Mexico U.S. Senate raceNorth Carolina U.S. Senate raceOklahoma U.S. Senate raceOregon U.S. Senate raceRhode Island U.S. Senate raceSouth Carolina U.S. Senate raceSouth Dakota U.S. Senate raceTennessee U.S. Senate raceTexas U.S. Senate raceVirginia U.S. Senate raceWest Virginia U.S. Senate raceWyoming U.S. Senate raceSubmit

A Republican Party primary takes place on June 2, 2026, in South Dakota to determine which Republican candidate will run in the state's general election on November 5, 2024.

Candidate filing deadline	Primary election	General election
March 31, 2026	June 2, 2026	November 3, 2026

Heading into the election, the incumbent was Mike Rounds (Republican), who was first elected in 2014.

A primary election is an election in which registered voters select a candidate that they believe should be a political party's candidate for elected office to run in the general election. They are also used to choose convention delegates and party leaders. Primaries are state-level and local-level elections that take place prior to a general election. South Dakota law allows parties to choose whether to let unaffiliated voters vote in their elections. For more information on recognized political parties in South Dakota and their primary policies, see here.

For information about which offices are nominated via primary election, see this article.

This page focuses on South Dakota's United States Senate Republican primary. For more in-depth information on the state's Democratic primary and the general election, see the following pages:

• United States Senate election in South Dakota, 2026 (June 2 Democratic primary)
• United States Senate election in South Dakota, 2026

Candidates and election results

Note: The following list includes official candidates only. Ballotpedia defines official candidates as people who:

• Register with a federal or state campaign finance agency before the candidate filing deadline
• Appear on candidate lists released by government election agencies

Republican primary election

Republican primary for U.S. Senate South Dakota

Incumbent Mike Rounds and Justin McNeal are running in the Republican primary for U.S. Senate South Dakota on June 2, 2026.

		Candidate
		Mike Rounds
	Submit photo	Justin McNeal

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Candidate profiles

There are currently no candidate profiles created for this race. Candidate profiles will appear here as they are created. Encourage the candidates in this race to complete Ballotpedia's Candidate Connection survey so that their profile will appear here. You can ask candidates in this race to fill out the survey by clicking their names below:

• Mike Rounds

Voting information

See also: Voting in South Dakota

Ballotpedia will publish the dates and deadlines related to this election as they are made available.

Campaign finance

Name	Party	Receipts*	Disbursements**	Cash on hand	Date
Mike Rounds	Republican Party	$2,792,218	$1,656,323	$2,818,417	As of September 30, 2025
Justin McNeal	Republican Party	$0	$0	$0	Data not available***
Source: Federal Elections Commission, "Campaign finance data," 2026. This product uses the openFEC API but is not endorsed or certified by the Federal Election Commission (FEC). * According to the FEC, "Receipts are anything of value (money, goods, services or property) received by a political committee." ** According to the FEC, a disbursement "is a purchase, payment, distribution, loan, advance, deposit or gift of money or anything of value to influence a federal election," plus other kinds of payments not made to influence a federal election. *** Candidate either did not report any receipts or disbursements to the FEC, or Ballotpedia did not find an FEC candidate ID.

Ballot access

The table below details filing requirements for U.S. Senate candidates in South Dakota in the 2026 election cycle. For additional information on candidate ballot access requirements in South Dakota, click here.

Filing requirements for U.S. Senate candidates, 2026
State	Office	Party	Signatures required	Filing fee	Filing deadline	Source
South Dakota	U.S. Senate	Republican	1,730	N/A	3/31/2026	Source
South Dakota	U.S. Senate	Democratic	1,615	N/A	3/31/2026	Source
South Dakota	U.S. Senate	Libertarian	50	N/A	3/31/2026	Source
South Dakota	U.S. Senate	Unaffiliated	3,393	N/A	4/28/2026	Source

See also

• United States Senate election in South Dakota, 2026 (June 2 Democratic primary)
• United States Senate election in South Dakota, 2026
• United States Senate Democratic Party primaries, 2026
• United States Senate Republican Party primaries, 2026
• United States Senate elections, 2026
• U.S. Senate battlegrounds, 2026

External links

Suggest a link

• Search Google News for this topic

Footnotes

[show]

South Dakota's current delegation to the United States Congress

Senators

Mike Rounds (R)

John Thune (R)

Representatives

Dusty Johnson (R)

Republican Party (3)

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Super PACs/Organizations

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