ManifoldPlay moneyPoliticsDevelopingUpdated 11m ago

Will Jamie Joyce win the 2026 12th California Congressional district race?

As of Oct 22, 2026, 6:04 AM ET, Manifold priced this market at 3.3% (down from 4.0% 24 hours earlier). It had 810 mana traded in the past 24 hours and 1K mana of pool liquidity. probcast.co rates the support behind this price as moderate.

Market probability
3.3%
−0.7 percentage points
over 24 hours4.0% → 3.3%

Play-money market (mana, not dollars) — thin market where small orders can move the price — though most recent trading came from one account.

Price historyManifold

Source: ProbCast snapshots (Manifold)

How credible was the move?

Methodology →

Move validity

Moderate

Consensus stability

Stable

Contract clarity

High

Can you trust this price?

Two different questions: how hard the price is to move, and whose trading set it.

Market capacity

How hard is it to move this price?

Thin

Pool liquidity

1K mana

Bid-ask spread

n/a

automated market maker

24h volume

810 mana

Total volume

17K mana

Play money: depth is in mana, so it says nothing about real-money conviction.

Who's trading

Whose opinion is this price?

One account dominates
84%of the traded money came from the single largest account

Accounts

16

Trades

41

over 125 days

Largest order

10K mana

13.3K mana traded across these 41 trades (last 125 days).

One account did most of the recent trading — the price reflects that account's view more than a crowd's.

Recent trade activity$13.3K traded

From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.

What this market actually measures

Resolution criteria This market resolves to YES if Jamie Joyce wins the general election for California's 12th Congressional District in the November 3, 2026, election. This market resolves to NO if Jamie Joyce does not win the election (e.g., if incumbent Lateefah Simon wins, or if any other candidate wins).

This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.

View full official resolution rules

Resolution criteria This market resolves to YES if Jamie Joyce wins the general election for California's 12th Congressional District in the November 3, 2026, election. This market resolves to NO if Jamie Joyce does not win the election (e.g., if incumbent Lateefah Simon wins, or if any other candidate wins). If Joyce withdraws, is disqualified, or does not appear on the general election ballot, the market resolves to NO (unless the certified winner is indeed Joyce). The primary source of truth for resolution will be the official election results certified by the California Secretary of State. If the race is mathematically decided and uncontested, the market may resolve early based on projections from the Associated Press or other major media outlets. Background District Information: California’s 12th Congressional District covers the East Bay area (including Oakland, Berkeley, Alameda, and Emeryville). With a Cook Partisan Voter Index of D+39, it is historically one of the most solidly Democratic districts in the nation. The Candidates: Challenger Jamie Joyce is a tech policy researcher, democracy tech activist, and founder of the non-profit Society Library. She is facing Democratic incumbent Lateefah Simon, who has held the seat since January 2025. Primary Results: In California's nonpartisan top-two primary held on June 2, 2026, Simon and Joyce were the only candidates on the ballot, meaning both advanced to the general election. Simon finished first in the primary with approximately 84.4% of the vote, and Joyce finished second with approximately 15.6%. I made this market in response to seeing this post: https://www.lesswrong.com/posts/RPsgjBsAbAuRQegjm/nunosempere-s-shortform?commentId=XyrDGDefBuicHqq47 . Seems like she was very funding-constrained and if that changes it could become a closer race than in the primary.

What could move this market next?

  • The market's deadline arrivesNovember 3, 2026 at 6:59 PM ET

    The contract must resolve based on what has happened by this date.

Derived from the contract's own mechanics as of Oct 22, 6:15 AM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.

Advanced analysis (experimental)

Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: low · expected error ±16 pts.

Thin marketLegacy movement classifier: watch

What's happening

medium classifier confidence
Thin market

Thin book and/or wide spread. Small orders can move this price disproportionately, so any single print is noisy and easily overread.

  • Thin book and/or wide spread.

Read with caution —Read the latest price with caution; conditions make it an unreliable summary right now.

More details — reliability score, dynamics, durability
Reliability score
26Low
Where the price path tends to go next525 observed
  • Illiquid / quiet98%
  • Choppy / mean-reverting1%

Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.

DurabilityHigh· half-life ~5d
PredictabilityStable

Secondary read: leaning toward Quote-driven.

A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.

Change (pts)1H0.06H-0.724H-0.77D-0.7