Massachusetts's status as one of the most reliably Democratic states in Senate elections underpins the market's heavy tilt toward a Democratic winner. Incumbent Ed Markey seeks a third full term against Republican John Deaton in the November 2026 general election, following a Democratic primary on September 1 that pits Markey against Representative Seth Moulton. No Republican has won a Massachusetts Senate race since 2010, reflecting consistent voter registration advantages, urban and suburban turnout patterns, and limited statewide Republican infrastructure. General election polling shows the Democratic nominee leading by wide margins regardless of primary outcome. While a major scandal, health event, or national political shift could narrow the gap, historical results and structural factors continue to anchor trader consensus around a Democratic hold.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedMassachusetts Senate Election Winner
Massachusetts Senate Election Winner
$24,225 Vol.
$24,225 Vol.
Nov 3, 2026
Democrat
97%
Republican
3%
$24,225 Vol.
$24,225 Vol.
Nov 3, 2026
Democrat
$18,799 Vol.
97%
Republican
$5,426 Vol.
3%
This market will resolve according to the winner of the 2026 midterm Massachusetts 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.Massachusetts's status as one of the most reliably Democratic states in Senate elections underpins the market's heavy tilt toward a Democratic winner. Incumbent Ed Markey seeks a third full term against Republican John Deaton in the November 2026 general election, following a Democratic primary on September 1 that pits Markey against Representative Seth Moulton. No Republican has won a Massachusetts Senate race since 2010, reflecting consistent voter registration advantages, urban and suburban turnout patterns, and limited statewide Republican infrastructure. General election polling shows the Democratic nominee leading by wide margins regardless of primary outcome. While a major scandal, health event, or national political shift could narrow the gap, historical results and structural factors continue to anchor trader consensus around a Democratic hold.
This market will resolve according to the winner of the 2026 midterm Massachusetts 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, 5:07 PM ET
Volume
$24,225End Date
Nov 3, 2026Market Opened
Oct 13, 2025, 5:07 PM ETResolver
0x2F5e3684c...This market will resolve according to the winner of the 2026 midterm Massachusetts 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.Massachusetts's status as one of the most reliably Democratic states in Senate elections underpins the market's heavy tilt toward a Democratic winner. Incumbent Ed Markey seeks a third full term against Republican John Deaton in the November 2026 general election, following a Democratic primary on September 1 that pits Markey against Representative Seth Moulton. No Republican has won a Massachusetts Senate race since 2010, reflecting consistent voter registration advantages, urban and suburban turnout patterns, and limited statewide Republican infrastructure. General election polling shows the Democratic nominee leading by wide margins regardless of primary outcome. While a major scandal, health event, or national political shift could narrow the gap, historical results and structural factors continue to anchor trader consensus around a Democratic hold.
This market will resolve according to the winner of the 2026 midterm Massachusetts 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
$24,225End Date
Nov 3, 2026Market Opened
Oct 13, 2025, 5:07 PM ETResolver
0x2F5e3684c...Massachusetts's status as one of the most reliably Democratic states in Senate elections underpins the market's heavy tilt toward a Democratic winner. Incumbent Ed Markey seeks a third full term against Republican John Deaton in the November 2026 general election, following a Democratic primary on September 1 that pits Markey against Representative Seth Moulton. No Republican has won a Massachusetts Senate race since 2010, reflecting consistent voter registration advantages, urban and suburban turnout patterns, and limited statewide Republican infrastructure. General election polling shows the Democratic nominee leading by wide margins regardless of primary outcome. While a major scandal, health event, or national political shift could narrow the gap, historical results and structural factors continue to anchor trader consensus around a Democratic hold.
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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