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Kalshi, Polymarket Signal 2026 Senate Control Near 50-50

By Drooid · Sep 16, 2026, 4:05 PM UTC · How we work

Summary

Democrats Lead Senate

Kalshi’s Senate-control market priced Democrats at 53 % and Republicans at 47 % on September 14.
Polymarket valued Democratic control at 54 % versus Republican 48 % with $4.45 million volume.
Nate Silver’s 2026 midterm forecast gave Democrats a 58.6 % chance of Senate control, up from 50.6 % on September 6.
Emerson College Poll’s August generic ballot showed Democrats at 51 % and Republicans at 43 %.

Summary

Trump Approval Stagnates

The New York Times/Siena poll found President Donald Trump’s approval rating at 38% among likely voters.
The rating has remained unchanged since Trump’s Iran war.
Voters disapproved of his handling of every major issue, especially the cost of living.
The poll found Republicans viewed as more extreme, elitist and corrupt than Democrats.

History

Historical Context

The 1994 Republican Revolution, culminating on November 8, 1994, flipped the Senate to a 54-seat Republican majority. The Republican Party, led by Newt Gingrich, secured a 7-seat net gain while Democrats fell to 46 seats, a shift quantified by a 12-point swing in national polls. Today's 2026 Senate-control markets on Kalshi and Polymarket echo 1994’s volatility, with Nate Silver’s FiveThirtyEight model and Emerson College poll showing Democrats leading by roughly five percentage points. That historic swing taught analysts that early-midterm sentiment can reshape congressional power, prompting campaign-finance firms and voter-mobilization groups to adjust strategies for the upcoming elections.

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Democrats Lead Senate

Kalshi’s Senate-control market priced Democrats at 53 % and Republicans at 47 % on September 14.
Polymarket valued Democratic control at 54 % versus Republican 48 % with $4.45 million volume.
Nate Silver’s 2026 midterm forecast gave Democrats a 58.6 % chance of Senate control, up from 50.6 % on September 6.
Emerson College Poll’s August generic ballot showed Democrats at 51 % and Republicans at 43 %.

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