Election explainer
US Midterms 2026: How Democrats or Republicans Can Control Congress
What a House or Senate majority means, why the chambers can split and why a lead is not a result.
Two elections, two majorities
Control of Congress is decided chamber by chamber. In a fully occupied 435-seat House, 218 seats form a majority. The Senate has 100 seats, but only part of the chamber is elected in a midterm cycle. A Senate election-night tally of newly won seats is therefore not the same as the total party balance.
What happens if the chambers split?
Most federal legislation needs approval in both chambers before reaching the president. Different party majorities can make agreement more difficult and increase the importance of negotiations. Control also shapes committee leadership and the subjects lawmakers investigate.
Can either party win?
That is an electoral question, not something the seat thresholds alone can answer. This explainer does not offer a probability forecast or describe a party as having won before sourced results establish it. Read dated reporting on individual contests alongside the national totals.
How to read a Senate tie
The vice president can break tied Senate votes. Independents and their caucus affiliations can also matter when assessing control. Watch the full membership, vacancies and caucus decisions rather than treating the number of races won this year as a majority calculation.