House · 3 November 2026

CA-20 House 2026

97.3% RVince Fong leads TruthIndex™Safe R

Polymarket: 98.2%
Kalshi: 97.0%
Spread: 1.1 pts
24h: –
7 days: −0.2
Updated: Oct 16, 2026, 1:45 PM ET

Vince Fong, last 60 days

How to read this chart

The green line is the TruthIndex™, the chance of this outcome. It combines the prices on both venues and gives more weight to the venue with more money in its order book. The two thinner lines are Polymarket's and Kalshi's own prices, and the grey band between them shows how far apart the two venues are.

The pale bands behind the lines are the rating zones (Toss-up, Lean, Likely and Safe), so you can see when the race moved from one rating to another. Move along the chart, or use the arrow keys, to read the values for each day.

All outcomes

Outcome	TruthIndex™		Polymarket	Kalshi	Spread	24h
RVince Fong	97.3%		98.2%	97.0%	1.1 pts	–
DSandra Van Scotter	2.2%		2.5%	2.0%	0.5 pts	–

Polymarket Kalshi

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Candidates & Background

Sandra Van Scotter

Democratic

Sandra Van Scotter, a Democrat and community activist, faces Republican incumbent Vince Fong in the 2026 election for California's 20th congressional district after finishing second in the top-two primary.

Full candidate profile →

Vince Fong

Republican U.S. Representative for California's 20th congressional district (since 2024)

Vince Fong, a Republican who has represented California's 20th congressional district in the U.S. House since 2024, faces Democrat Sandra Van Scotter, a community activist, in his 2026 reelection race.

Born 1979 · Bakersfield, California

Full candidate profile →

Margin of victory

Each venue's margin market, shown on its own: the two venues set their ranges differently.

Kalshi435 contracts

California's 20th District margin of victory

Fong, 12+ pts		96.8%
Fong, 15+ pts		96.5%
Fong, 18+ pts		95.6%
Fong, 21+ pts		93.7%
Fong, 24+ pts		87.9%
Fong, 27+ pts		78.0%
Fong, 30+ pts		65.0%
Fong, 33+ pts		49.5%
Fong, 36+ pts		–
Fong, 39+ pts		21.0%
Fong, 42+ pts		10.2%

Source: Kalshi market

Each venue's market

Polymarket$49.8K traded

Prices which party wins.

Vince Fong: Counted · bid 97.0% / ask 99.3% · $198 within 5 pts

This market will resolve according to the party of the candidate who wins the CA-20 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026. A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time all of the 2026 House elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican parties will be considered a member of one of these parties based on the party with which they most recently expressed their intent to caucus at the time all of the House elections are conclusively called by this market's resolution sources. This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the United States government, specifically the Federal Election Commission (https://www.fec.gov/).

Full rules on Polymarket

Kalshi5.1K contracts traded