United States Senate election in South Dakota, 2026 (June 2 Republican primary)
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| U.S. Senate, South Dakota |
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| 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. |
| Race ratings |
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 • At-large South Dakota elections, 2026 U.S. Congress elections, 2026 U.S. Senate elections, 2026 U.S. House elections, 2026 |
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 |
|---|---|---|
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.[1]
For information about which offices are nominated via primary election, see this article.
Thirty-three of the 100 U.S. Senate seats are up for election, and another two seats are up for special election. Democrats hold 13 of the seats up for election, and Republicans hold 22. As of January 2026, nine members of the U.S. Senate announced they are not running for re-election. To read more about the U.S. Senate elections taking place this year, click here.
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 | |
| Justin McNeal | ||
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 = candidate completed the Ballotpedia Candidate Connection survey. | ||||
| If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey. | ||||
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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:
Voting information
- See also: Voting in South Dakota
Campaign finance
| Name | Party | Receipts* | Disbursements** | Cash on hand | Date |
|---|---|---|---|---|---|
| Mike Rounds | Republican Party | $3,188,339 | $1,975,401 | $2,895,460 | As of December 31, 2025 |
| Justin McNeal | Republican Party | $130 | $5 | $125 | As of December 31, 2025 |
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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." |
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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 | ||||||
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| 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
Footnotes
