Incumbent Democratic Sen. Chris Coons secured his party's nomination with roughly 78% of the primary vote on September 15, 2026, advancing to face Republican nominee Michael Katz in the November 3 general election. Delaware has not elected a Republican to the Senate since 1994, and the state's consistent Democratic performance in recent cycles—including a 14.7-point margin for the party's presidential nominee in 2024—underpins trader consensus for a strong hold. All major forecasting outlets rate the contest Solid or Safe Democratic, reflecting Coons' long incumbency since 2010, limited Republican infrastructure, and the absence of competitive polling that would signal an upset path. A late national Republican surge in the midterms or an unforeseen development affecting the incumbent could theoretically narrow the margin, though structural barriers remain substantial.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedDelaware Senate Election Winner
$19,382 Vol.
$19,382 Vol.

Democrat
96%

Republican
4%
$19,382 Vol.
$19,382 Vol.

Democrat
96%

Republican
4%
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, 5:35 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...Incumbent Democratic Sen. Chris Coons secured his party's nomination with roughly 78% of the primary vote on September 15, 2026, advancing to face Republican nominee Michael Katz in the November 3 general election. Delaware has not elected a Republican to the Senate since 1994, and the state's consistent Democratic performance in recent cycles—including a 14.7-point margin for the party's presidential nominee in 2024—underpins trader consensus for a strong hold. All major forecasting outlets rate the contest Solid or Safe Democratic, reflecting Coons' long incumbency since 2010, limited Republican infrastructure, and the absence of competitive polling that would signal an upset path. A late national Republican surge in the midterms or an unforeseen development affecting the incumbent could theoretically narrow the margin, though structural barriers remain substantial.
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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