Ed Markey’s decisive win in the September 1 Democratic primary against Seth Moulton has reinforced his position as the clear favorite in Massachusetts’ solidly Democratic Senate race. The incumbent secured roughly 65 percent of the primary vote by highlighting progressive priorities that align with the state’s voter base, while Republican nominee John Deaton advanced unopposed after his 2024 Senate bid. Recent polling averages show Markey ahead by roughly 20 points, consistent with the commonwealth’s long-standing partisan lean and the limited path available to challengers in non-presidential years. Trader consensus reflected in current pricing accounts for these structural advantages. Even at high probabilities, outcomes could shift if Markey encounters a significant health event, major scandal, or if Deaton capitalizes on unexpected turnout or national political changes before the November 3 general election.
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
$48,356 Vol.
$48,356 Vol.
Nov 2, 2026
Ed Markey (D)
98%
John Deaton (R)
2%
$48,356 Vol.
$48,356 Vol.
Nov 2, 2026
Ed Markey (D)
$35,260 Vol.
98%
John Deaton (R)
$13,095 Vol.
2%
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 candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of 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.Ed Markey’s decisive win in the September 1 Democratic primary against Seth Moulton has reinforced his position as the clear favorite in Massachusetts’ solidly Democratic Senate race. The incumbent secured roughly 65 percent of the primary vote by highlighting progressive priorities that align with the state’s voter base, while Republican nominee John Deaton advanced unopposed after his 2024 Senate bid. Recent polling averages show Markey ahead by roughly 20 points, consistent with the commonwealth’s long-standing partisan lean and the limited path available to challengers in non-presidential years. Trader consensus reflected in current pricing accounts for these structural advantages. Even at high probabilities, outcomes could shift if Markey encounters a significant health event, major scandal, or if Deaton capitalizes on unexpected turnout or national political changes before the November 3 general election.
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 candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of 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 candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of 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
$48,356End 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 candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of 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.Ed Markey’s decisive win in the September 1 Democratic primary against Seth Moulton has reinforced his position as the clear favorite in Massachusetts’ solidly Democratic Senate race. The incumbent secured roughly 65 percent of the primary vote by highlighting progressive priorities that align with the state’s voter base, while Republican nominee John Deaton advanced unopposed after his 2024 Senate bid. Recent polling averages show Markey ahead by roughly 20 points, consistent with the commonwealth’s long-standing partisan lean and the limited path available to challengers in non-presidential years. Trader consensus reflected in current pricing accounts for these structural advantages. Even at high probabilities, outcomes could shift if Markey encounters a significant health event, major scandal, or if Deaton capitalizes on unexpected turnout or national political changes before the November 3 general election.
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 candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of 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 candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of 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
$48,356End Date
Nov 3, 2026Market Opened
Oct 13, 2025, 5:07 PM ETResolver
0x2F5e3684c...Ed Markey’s decisive win in the September 1 Democratic primary against Seth Moulton has reinforced his position as the clear favorite in Massachusetts’ solidly Democratic Senate race. The incumbent secured roughly 65 percent of the primary vote by highlighting progressive priorities that align with the state’s voter base, while Republican nominee John Deaton advanced unopposed after his 2024 Senate bid. Recent polling averages show Markey ahead by roughly 20 points, consistent with the commonwealth’s long-standing partisan lean and the limited path available to challengers in non-presidential years. Trader consensus reflected in current pricing accounts for these structural advantages. Even at high probabilities, outcomes could shift if Markey encounters a significant health event, major scandal, or if Deaton capitalizes on unexpected turnout or national political changes before the November 3 general election.
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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