Aug 18, 2026
Probability rose from 94.8% to 97.0% — a 2.2-point move over the past day.
Around this time: What to know about California’s special election to replace Eric Swalwell — Al Jazeera
Prediction markets give the Democratic Party a near-certain chance of retaining California's 34th congressional district, priced at 96.4%. The market will settle based on the outcome of the November 3, 2026 midterm election.
Will the Democratic Party win the CA-34 House seat?
Updated · Volume $49.5K
| Outcome | Probability | 24h |
|---|---|---|
| Will the Democratic Party win the CA-34 House seat? | 96.4% | -1.1 |
| Will the Republican Party win the CA-34 House seat? | 0.3% | -0.1 |
| Will another party win the CA-34 House seat? | 0.0% | 0.0 |
| Will C win the CA-34 House seat? | 0.0% | 0.0 |
| Will A win the CA-34 House seat? | 0.0% | 0.0 |
| Will E win the CA-34 House seat? | 0.0% | 0.0 |
| Will B win the CA-34 House seat? | 0.0% | 0.0 |
| Will D win the CA-34 House seat? | 0.0% | 0.0 |
The Democratic candidate is the overwhelming front-runner; the remaining outcomes—a Republican pickup or any other result—are priced as remote tail risks.
Aug 18, 2026
Probability rose from 94.8% to 97.0% — a 2.2-point move over the past day.
Around this time: What to know about California’s special election to replace Eric Swalwell — Al Jazeera
CA-34 is not a market that surprises. The contract has hovered near its upper bound for the entire tracking period, pricing a Democratic hold at 96.4% as of 16 min ago. The mechanics are straightforward. The market resolves to the party of the candidate who wins California’s 34th congressional district in the November 3, 2026 midterm elections. A candidate’s party is taken from the ballot; if no party is listed, the market uses the candidate’s most recent expression of intent to caucus with a party at the time all House elections are conclusively called. Resolution is driven first by a consensus of credible reporting. If news organisations do not agree on the winner, the Federal Election Commission’s official results become the sole arbiter. The election on Nov 3, 2026 is the only mandatory checkpoint. Before that, developments such as candidate filings, primary outcomes, or polling releases could affect the price. But because the contract depends on a single event—the certified result or a unanimity of news calls—it will not settle early and is insulated from the kind of minute-by-minute trading seen in multi-leg contracts. Traders who hold the contract through the election will wait for a clear call; in a safe district, that call often comes within hours of polls closing.
The market resolves after the November 3, 2026 election, once a consensus of credible reporting has called the winner or the FEC releases official results.
By the party listed on the ballot. If a candidate runs without a party label, their expressed caucus intent at the time the election is called is used.
The market stays open until a consensus emerges or official FEC results are published, which could take days or weeks in a tight race.
Only the party of the winner matters. If a Democrat wins, the market resolves for the Democratic Party regardless of the individual.
The market does not list specific outlets, but it typically refers to major news organisations that call U.S. elections, such as the Associated Press or television networks.
Data: Polymarket · Methodology · Not financial advice