Incumbent Democratic Representative Sarah McBride faces Republican Joseph Arminio in Delaware’s at-large House district on November 3, 2026. The seat has favored Democrats consistently, with McBride securing reelection after winning the 2024 general by double digits in a district that aligns with statewide Democratic registration advantages and voting patterns. Nonpartisan forecasters rate the contest Safe Democratic or Solid Democratic based on historical margins, limited Republican primary competition, and the absence of recent polling shifts. Trader consensus reflected in the 98.2% Democratic probability aligns with these structural factors. A late development such as an unforeseen scandal, significant health event, or national partisan wave could still alter the outcome before Election Day, though such shifts remain uncommon in this low-competition environment.