The open seat created by Democratic Sen. Jeanne Shaheen’s retirement has positioned Rep. Chris Pappas as the likely Democratic nominee and former Sen. John E. Sununu as the probable Republican nominee ahead of the Sept. 8 primaries. New Hampshire has not elected a Republican to the Senate since 2010, and recent polling averages show Pappas holding a narrow lead over Sununu, though one late August University of New Hampshire survey found Sununu ahead by two points. Party ratings from Cook, Sabato, and Inside Elections classify the contest as Lean or Tilt Democratic. Traders appear to weigh the state’s recent federal voting patterns and Democratic structural advantages more heavily than the competitiveness of individual head-to-head matchups.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated$96,247 Vol.
$96,247 Vol.

Democrat
84%

Republican
18%
$96,247 Vol.
$96,247 Vol.

Democrat
84%

Republican
18%
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
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...The open seat created by Democratic Sen. Jeanne Shaheen’s retirement has positioned Rep. Chris Pappas as the likely Democratic nominee and former Sen. John E. Sununu as the probable Republican nominee ahead of the Sept. 8 primaries. New Hampshire has not elected a Republican to the Senate since 2010, and recent polling averages show Pappas holding a narrow lead over Sununu, though one late August University of New Hampshire survey found Sununu ahead by two points. Party ratings from Cook, Sabato, and Inside Elections classify the contest as Lean or Tilt Democratic. Traders appear to weigh the state’s recent federal voting patterns and Democratic structural advantages more heavily than the competitiveness of individual head-to-head matchups.
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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