Dan Koh leads the Democratic primary for Massachusetts' 6th Congressional District after the open seat emerged when incumbent Seth Moulton launched a Senate bid. Koh's dominant fundraising edge, exceeding $3.5 million, combined with endorsements from former President Biden, Pete Buttigieg, labor unions, and End Citizens United, has driven trader consensus toward his 75% implied probability. State Representative Tram Nguyen trails at 18.8% despite leading a recent internal poll at 28%, while the remaining field—including Kevin Larivee and others—holds single-digit shares amid a September 1 primary. The crowded contest features seven Democrats, with voter indecision and grassroots mobilization shaping the final stretch.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedDan Koh 75%
Tram Nguyen 11.4%
Kevin Larivee 4.0%
Seth Moulton 3.5%
$39,988 Vol.
$39,988 Vol.
Dan Koh
75%
Tram Nguyen
18%
Kevin Larivee
4%
Seth Moulton
3%
John Beccia
2%
Mariah Lancaster
2%
Beth Andres-Beck
1%
Rick Jakious
1%
Dominick Pangallo
<1%
Jamie Zahlaway Belsito
<1%
Rachel Creemers
<1%
Diann Slavit Baylis
<1%
Dan Koh 75%
Tram Nguyen 11.4%
Kevin Larivee 4.0%
Seth Moulton 3.5%
$39,988 Vol.
$39,988 Vol.
Dan Koh
75%
Tram Nguyen
18%
Kevin Larivee
4%
Seth Moulton
3%
John Beccia
2%
Mariah Lancaster
2%
Beth Andres-Beck
1%
Rick Jakious
1%
Dominick Pangallo
<1%
Jamie Zahlaway Belsito
<1%
Rachel Creemers
<1%
Diann Slavit Baylis
<1%
If no nominee is announced by November 3, 2026, 11:59PM ET, this market will resolve to "Other".
The resolution source for this market will be a consensus of official Democrat sources, including https://democrats.org/.
Any replacement of the nominee before election day will not change the resolution of the market.
Market Opened: Nov 25, 2025, 3:39 PM ET
Resolver
0x2F5e3684c...If no nominee is announced by November 3, 2026, 11:59PM ET, this market will resolve to "Other".
The resolution source for this market will be a consensus of official Democrat sources, including https://democrats.org/.
Any replacement of the nominee before election day will not change the resolution of the market.
Resolver
0x2F5e3684c...Dan Koh leads the Democratic primary for Massachusetts' 6th Congressional District after the open seat emerged when incumbent Seth Moulton launched a Senate bid. Koh's dominant fundraising edge, exceeding $3.5 million, combined with endorsements from former President Biden, Pete Buttigieg, labor unions, and End Citizens United, has driven trader consensus toward his 75% implied probability. State Representative Tram Nguyen trails at 18.8% despite leading a recent internal poll at 28%, while the remaining field—including Kevin Larivee and others—holds single-digit shares amid a September 1 primary. The crowded contest features seven Democrats, with voter indecision and grassroots mobilization shaping the final stretch.
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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