Dems Have 74.8% Senate Odds, History Warns of Market Drop

Democrats now have 74.8% chance of flipping Senate, historical data suggests stock market could fall.

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Oct 12, 2026

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Dems Have 74.8% Senate Odds, History Warns of Market Drop

Democrats now have 74.8% chance of flipping Senate, historical data suggests stock market could fall.

In brief

Democrats now have 74.8% chance of flipping Senate, historical data suggests stock market could fall. Historical data shows years with Republican presidents and Democratic Senates had 3.0% average S&P 500 returns, signaling potential market decline. Originally reported by 24/7 Wall St..

Senate Odds

Prediction markets now give Democrats 74.8% chance of flipping Senate.

Historical Market Data

Years with Republican presidents and Democratic Senates averaged 3.0% S&P 500 returns over 24 years.

House Data Contrasts

House Data Contrasts

Under Republican presidents, Democratic Houses averaged 7.9% returns over 33 years.

Model Disagreement

Polymarket prices Democratic Senate control at 63.5%, while Decision Desk HQ gives 56%.

Market Warning Sign

Historical data suggests a Republican president with Democratic Senate could signal stock market decline.

Here's the gist

Historical data shows years with Republican presidents and Democratic Senates had 3.0% average S&P 500 returns, signaling potential market decline.

Read the original on 24/7 Wall St.

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