# Will Brazil Union win the 2026 Brazilian Senate election

> Liquidity-weighted aggregate at 42% across 2 contracts — refreshed 47 min ago.

URL: https://simplefunctions.dev/odds/brazilsenate
Updated: 2026-08-27T07:21:47.918Z
Category: politics · Topic: election-2026
Status: active
Closes: 2027-10-04

## Headline

- Probability: 42% (liquidity-weighted across 2 contracts)
- Venue: Kalshi (2 contracts)
- 24h volume: $7

## Bound contracts (2)

| Outcome | Price | 24h | Volume | Venue | Slug |
|---|---|---|---|---|---|
| Liberal Party | 75¢ | ±0 | $7 | kalshi | /markets/will-liberal-party-win-the-2026-brazilian-senate-e-kalshi-kxbrazilsenate-26oct04-pl |
| Brazilian Democratic Movement | 8¢ | −1pp | $0 | kalshi | /markets/will-brazilian-democratic-movement-win-the-2026-br-kalshi-kxbrazilsenate-26oct04-mdb |

## 30-day trajectory

| Day | Aggregate |
|---|---|
| 2026-07-29 | 71 |
| 2026-08-13 | 41 |
| 2026-08-20 | 39 |
| 2026-08-27 | 4 |

_25 days of price history captured. Each row is the daily mean of intraday 5-min captures._

## What moved the line

- 2026-08-20 · Liberal Party −4pp 76→72¢ · kalshi
- 2026-08-22 · Brazilian Democratic Movement +3pp 5→8¢ · kalshi
- 2026-08-26 · Brazilian Democratic Movement −3pp 8→5¢ · kalshi

## Analysis

This probability reflects market expectations that Brazil Union will finish among the top vote-getters in the 2026 Brazilian Senate election. At 30%, the market implies Brazil Union is a credible but not dominant force in the race. The current level reflects Brazil Union's existing political position and recent polling, though Senate elections involve multiple parties competing for seats across state-level races. The probability could shift based on changes in party leadership, coalition agreements, or shifts in voter preferences captured by polling. The 2026 Senate election itself, scheduled for early October 2026, will definitively resolve whether Brazil Union achieves the vote share needed to be among top performers.

### Key factors

- Brazil Union's current polling average and historical performance in recent Brazilian elections relative to competitors
- Coalition formation dynamics and whether Brazil Union enters into strategic alliances that affect vote distribution
- Changes in party leadership, candidate quality, or public scandals affecting party favorability
- Liberal Party's dominant market position (82¢) suggests consolidated expectation that a major party outperforms Brazil Union
- Actual election results in early October 2026 will provide definitive measurement of Brazil Union's vote share and seat allocation

## Methodology

Probability is **liquidity-weighted** across all bound Kalshi/Polymarket contracts: Σ(price × volume) ÷ Σ(volume). 30-day trajectory uses the daily mean of intraday 5-min captures. 24h delta = today's mean − yesterday's mean. Movement events are ≥3pp daily moves in the last 7 days.

## How to use this data

- HTML: https://simplefunctions.dev/odds/brazilsenate
- JSON: https://simplefunctions.dev/api/public/odds?slug=brazilsenate
- Topic hub: https://simplefunctions.dev/predictions/election-2026

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