South Dakota's strong Republican tilt, reinforced by consistent double-digit margins in recent federal contests, underpins trader consensus around incumbent Mike Rounds. Rounds secured his party's nomination by a wide primary margin in June and maintains a substantial fundraising lead. The Democratic nominee's withdrawal in early August left independent Brian Bengs as the primary challenger, a development that has not shifted the race's fundamentals according to nonpartisan ratings classifying it as safe or solid Republican. Polling shows Rounds ahead by double digits in most surveys, consistent with the state's voting patterns. Late developments such as an unforeseen scandal, significant health issue, or dramatic national political realignment would be required to alter the outcome before November 3.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedSouth Dakota Senate Election Winner
South Dakota Senate Election Winner
Mike Rounds (R) 94.5%
Brian Bengs (I) 5.6%
Democrat <1%
$26,512 Vol.
$26,512 Vol.
Nov 2, 2026
Mike Rounds (R)
95%
Brian Bengs (I)
6%
Democrat
<1%
Mike Rounds (R) 94.5%
Brian Bengs (I) 5.6%
Democrat <1%
$26,512 Vol.
$26,512 Vol.
Nov 2, 2026
Mike Rounds (R)
$13,151 Vol.
95%
Brian Bengs (I)
$907 Vol.
6%
Democrat
$12,454 Vol.
<1%
This market will resolve according to the winner of the 2026 midterm South Dakota U.S. Senate election, inclusive of any run-offs.
A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.
Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.
The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.South Dakota's strong Republican tilt, reinforced by consistent double-digit margins in recent federal contests, underpins trader consensus around incumbent Mike Rounds. Rounds secured his party's nomination by a wide primary margin in June and maintains a substantial fundraising lead. The Democratic nominee's withdrawal in early August left independent Brian Bengs as the primary challenger, a development that has not shifted the race's fundamentals according to nonpartisan ratings classifying it as safe or solid Republican. Polling shows Rounds ahead by double digits in most surveys, consistent with the state's voting patterns. Late developments such as an unforeseen scandal, significant health issue, or dramatic national political realignment would be required to alter the outcome before November 3.
This market will resolve according to the winner of the 2026 midterm South Dakota U.S. Senate election, inclusive of any run-offs.
A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.
Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.
The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.
A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.
Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.
The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.
Market Opened: Oct 13, 2025, 5:04 PM ET
Volume
$26,512End Date
Nov 3, 2026Market Opened
Oct 13, 2025, 5:04 PM ETResolver
0x2F5e3684c...This market will resolve according to the winner of the 2026 midterm South Dakota U.S. Senate election, inclusive of any run-offs.
A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.
Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.
The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.South Dakota's strong Republican tilt, reinforced by consistent double-digit margins in recent federal contests, underpins trader consensus around incumbent Mike Rounds. Rounds secured his party's nomination by a wide primary margin in June and maintains a substantial fundraising lead. The Democratic nominee's withdrawal in early August left independent Brian Bengs as the primary challenger, a development that has not shifted the race's fundamentals according to nonpartisan ratings classifying it as safe or solid Republican. Polling shows Rounds ahead by double digits in most surveys, consistent with the state's voting patterns. Late developments such as an unforeseen scandal, significant health issue, or dramatic national political realignment would be required to alter the outcome before November 3.
This market will resolve according to the winner of the 2026 midterm South Dakota U.S. Senate election, inclusive of any run-offs.
A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.
Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.
The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.
A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.
Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.
The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.
Volume
$26,512End Date
Nov 3, 2026Market Opened
Oct 13, 2025, 5:04 PM ETResolver
0x2F5e3684c...South Dakota's strong Republican tilt, reinforced by consistent double-digit margins in recent federal contests, underpins trader consensus around incumbent Mike Rounds. Rounds secured his party's nomination by a wide primary margin in June and maintains a substantial fundraising lead. The Democratic nominee's withdrawal in early August left independent Brian Bengs as the primary challenger, a development that has not shifted the race's fundamentals according to nonpartisan ratings classifying it as safe or solid Republican. Polling shows Rounds ahead by double digits in most surveys, consistent with the state's voting patterns. Late developments such as an unforeseen scandal, significant health issue, or dramatic national political realignment would be required to alter the outcome before November 3.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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