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Bombshell shift in race to replace Nancy Pelosi as new odds drop on Election Day
Prediction markets shifted sharply in favour of California state Senator Scott Wiener in the contest to replace Nancy Pelosi in the US House, despite Pelosi backing San Francisco Supervisor Connie Chan. The race matters as the first major contest over Pelosi’s San Francisco seat since she won it in 1987, and tests how much influence her endorsement carries.
Kalshi put Wiener’s chances as high as 94% on Tuesday evening, up from 82% at noon; another market listed him at 83% and Chan at 19%. A University of Southern California poll had Wiener ahead 47% to 41%, with 9% undecided, though the 4.6-point margin of error means the candidates’ support was statistically close. The Democrats broadly agree on national issues but represent different party factions: Wiener is seen as more establishment, while Chan is backed by unions and progressive activists.
In short
- Prediction markets swung towards Scott Wiener in the race to succeed Nancy Pelosi.
- Pelosi endorsed Connie Chan, who trails Wiener in a recent poll.
- The contest pits establishment and progressive Democratic factions against each other.
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
Wiener’s apparent lead may reflect voters’ preference for a candidate seen as experienced and aligned with the party’s established leadership, as well as a broader coalition of support in the district. Prediction markets and the USC poll both point towards momentum for him, although the poll’s margin of error leaves the race close.
The case against
Chan’s supporters can argue that Pelosi’s endorsement and backing from unions and progressive activists show meaningful support for a candidate rooted in the district’s progressive organising. With the poll leaving the candidates statistically close and prediction markets reflecting expectations rather than votes, the late shift in odds does not settle whether Wiener has a decisive mandate.
Explained simply
Nancy Pelosi has represented San Francisco in the US House of Representatives since 1987. She was the first woman to serve as Speaker of the House, the chamber’s presiding officer, and remains a prominent figure in the Democratic Party.
The district is a strongly Democratic part of California, so the contest is between Democrats. State Senator Scott Wiener and San Francisco Supervisor Connie Chan come from different parts of the party: Wiener is seen as closer to its establishment, while Chan has support from unions and progressive activists.
The result could shape who represents San Francisco in Congress and offer a test of how much weight Pelosi’s support carries with voters. Both candidates broadly agree on national issues, so their differences are more about political alliances and priorities than party affiliation.