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Delaware primary sets up House race as congressional turnover reaches 99 seats

Joseph Arminio won the GOP nomination to challenge Representative Sarah McBride as 99 congressional seats change hands.

Updated Sep 16, 2026 · 17:56 UTC3 reports

The short version

  • Delaware Republicans nominated Joseph Arminio to challenge Democratic Representative Sarah McBride, who ran unopposed in her primary.[Fox News · Fox News]
  • According to an NPR tracker, 99 congressional seats—83 in the House and 16 in the Senate—are guaranteed to change members.[NPR]
  • Across both chambers, 13 incumbents were defeated in primary contests alongside dozens of retirements, resignations, and deaths.[NPR]

Key facts

  • Delaware Republicans nominated Joseph Arminio for the state's U.S. House seat after he defeated Earl Cooper and John Whalen.[Fox News]
  • Representative Sarah McBride was unopposed in the Democratic primary for Delaware's House seat.[Fox News]
  • NPR tracking indicates 99 congressional seats are guaranteed to have a different member compared to the start of 2025.[NPR]
  • Primary challenges defeated 13 incumbent lawmakers during the primary season.[NPR]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.