Democrat Analilia Mejía won New Jersey's 11th Congressional District special election, filling the seat vacated when her predecessor became governor. Republicans held a 218-214 House majority before this election and can lose no more than two seats total to retain control, so this Democratic gain further narrows their margin in an already fragile majority. Democrats need a net gain of three districts in the 2026 midterms to flip the House, while Republicans can afford to lose only two.