# Balance of Power: 2026 Midterms: D Senate, R House

> Closed. Last odds frozen 22 h ago — final outcome on the venue.

URL: https://simplefunctions.dev/odds/balance-of-power-midterms-d-senate-r-house
Updated: 2026-05-08T06:35:30.952Z
Category: general · Topic: election-2026
Status: historical
Closes: 2026-11-03

## Headline

- Probability: 3% (liquidity-weighted across 1 contract)
- Venue: Polymarket (1 contract)
- 24h volume: $22K

## Bound contracts (1)

| Outcome | Price | 24h | Volume | Venue | Slug |
|---|---|---|---|---|---|
| 2026 Midterms: D Senate, R House | 3¢ | ±0 | $22K | polymarket | /markets/balance-of-power-2026-midterms-d-senate-r-house-polymarket-0x0808de4f0cfd47947f2d1be51f9a9c52ea0fec76f73a75cfbe79ddec98d8a908 |

## 30-day trajectory

| Day | Aggregate |
|---|---|
| 2026-04-09 | 0 |
| 2026-04-25 | 1 |
| 2026-04-28 | 19 |
| 2026-05-08 | 2 |

_13 days of price history captured. Each row is the daily mean of intraday 5-min captures._

## What moved the line

- 2026-05-06 · 2026 Midterms: D Senate, R House −18pp 19→1¢ · polymarket

## Analysis

This contract predicts Democrats will control the Senate while Republicans control the House following the 2026 midterm elections. At 3% probability, the market treats this outcome as unlikely. The Senate has historically favored Democrats more than the House in recent cycles, but achieving simultaneous control of both chambers requires a specific electoral alignment. The 2026 midterms will largely turn on economic conditions, approval ratings, and seat geography—particularly how many competitive districts and Senate races favor each party. Current polling and fundamentals drive expectations, though campaigns and external events will shape the final outcome. The resolution occurs on November 3, 2026, when midterm results are finalized. Between now and then, economic data, congressional actions, and internal party dynamics will test whether this scenario becomes more or less plausible.

### Key factors

- Current House composition and the number of seats Republicans would need to lose to yield Democratic control, compared to Senate dynamics favoring Democratic incumbents
- Economic indicators including inflation, employment, and GDP growth in the 12 months leading to November 2026, historically the strongest predictor of midterm performance
- Presidential approval rating and generic ballot polling trends in the spring and summer of 2026, which typically correlate with midterm outcomes
- Senate seat map composition, including number of Democratic versus Republican seats up for election and their competitiveness levels
- Unexpected political events or crises between May 2026 and November 2026 that could shift voter sentiment directionally

## 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/balance-of-power-midterms-d-senate-r-house
- JSON: https://simplefunctions.dev/api/public/odds?slug=balance-of-power-midterms-d-senate-r-house
- Topic hub: https://simplefunctions.dev/predictions/election-2026

## License

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