Gerrymandering Math: How 7% of Voters Decide 60% of Congressional Seats

01 The Competitiveness Crisis

In 2024, only 42 of 435 House races were decided by less than 5 points. That's under 10% of all districts. The remaining 90%+ were foregone conclusions decided not by voters in November but by mapmakers in the state legislature two years earlier. When politicians pick their voters instead of voters picking their politicians, the general election becomes a formality.

02 The Efficiency Gap

Political scientists use a metric called the 'efficiency gap' — the difference between wasted votes for each party. A district is competitive when both parties waste roughly equal votes. When one party consistently wastes fewer, the map is rigged. In 2024, the median efficiency gap across all states was 12%, meaning one party systematically overperformed its vote share by 12 percentage points purely through map geometry.

03 Can Math Fix It?

Several states have adopted independent redistricting commissions. The results are measurable: commission-drawn maps have a median margin of 14 points, compared to 23 points for legislature-drawn maps. That's not perfect, but it doubles the number of competitive seats. The catch: 26 states still let politicians draw their own district lines, and the Supreme Court has ruled federal courts can't intervene.