The fight over congressional voting maps
U.S. Politics & Government
Last updated
The big picture
Redistricting means drawing the boundaries of electoral districts. Because House members are elected district by district, changing a map can change which party is favored even without changing anyone’s vote. States normally redraw after the census, but the run-up to the 2026 election has brought an unusual wave of mid-decade changes. Courts are also deciding which maps can be used. Those legal battles concern representation and voting protections, while the political contest concerns control of Congress. The two overlap, but neither a party’s preferred map nor a temporary court order guarantees an election result. The strength of candidates and changes in voter support still matter within the new boundaries.
Where things stand
Multiple states are using new maps in the 2026 contest, and Supreme Court decisions have reshaped the electoral battlefield. Some districts redrawn to favor Republicans have become competitive as the political environment changes. This page tracks the national map dispute; the separate election page covers the voting calendar and the institutions being elected.
Key facts
- A district boundary can change the electorate without changing the size of the House.
- By late September, new maps in nine states affected roughly one in ten voters.
- A favorable map is an advantage, not a prediction that every targeted seat will be won.
How we got here
A nationwide review describes new congressional maps in nine states.
Reporting identifies competitive races in districts redrawn to favor Republicans.
A review examines how Supreme Court decisions have changed the midterm contest.
What happens next
No further event was confirmed at the last update.
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