Trader consensus heavily favors Republicans at 92.5% implied probability for Oklahoma's open U.S. Senate seat in the November 2026 general election, driven by the state's entrenched Republican dominance—no Democrat has won since 1948—and strong GOP primary positioning ahead of the June 16 contest. Incumbent Sen. Markwayne Mullin's confirmation as DHS Secretary created the vacancy, prompting U.S. Rep. Kevin Hern's March announcement and subsequent endorsement from President Trump, bolstering his frontrunner status amid a crowded Republican field lacking serious challengers. Democrats, led by figures like Jasmine Thomas, face steep structural barriers in this deep-red state with no recent polling indicating competitiveness. Upsets would require a divisive GOP primary fallout, nominee scandal, or national Democratic wave, though historical base rates and incumbency patterns make such shifts improbable.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated$13,381 Vol.
$13,381 Vol.

Republican
93%

Democrat
6%
$13,381 Vol.
$13,381 Vol.

Republican
93%

Democrat
6%
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, 4:48 PM ET
Resolver
0x2F5e3684c...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.
Resolver
0x2F5e3684c...Trader consensus heavily favors Republicans at 92.5% implied probability for Oklahoma's open U.S. Senate seat in the November 2026 general election, driven by the state's entrenched Republican dominance—no Democrat has won since 1948—and strong GOP primary positioning ahead of the June 16 contest. Incumbent Sen. Markwayne Mullin's confirmation as DHS Secretary created the vacancy, prompting U.S. Rep. Kevin Hern's March announcement and subsequent endorsement from President Trump, bolstering his frontrunner status amid a crowded Republican field lacking serious challengers. Democrats, led by figures like Jasmine Thomas, face steep structural barriers in this deep-red state with no recent polling indicating competitiveness. Upsets would require a divisive GOP primary fallout, nominee scandal, or national Democratic wave, though historical base rates and incumbency patterns make such shifts improbable.
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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