Kentucky Primary Day: Trump-Backed Gallrein vs. Massie in Most Expensive House Primary in US History — Polls Close; Results Awaited

Polls closed on May 19, 2026 in the Kentucky 4th Congressional District Republican primary — the most expensive House primary in US history at $32 million+ in total ad spending. Trump-backed challenger Ed Gallrein, a farmer and former Navy SEAL, faced seven-term incumbent Rep. Thomas Massie in a race that became the defining MAGA loyalty test of the 2026 primary cycle. Final pre-election polling showed Gallrein leading 48.3% to 43.1% (Quantus Insights, n=908 likely GOP primary voters); prediction markets placed Gallrein's odds at approximately 57%. The race drew over $9 million from pro-Israel interest groups targeting Massie for his consistent foreign aid opposition. Defense Secretary Pete Hegseth personally appeared at Gallrein campaign events, underscoring the administration's full-throated investment. Massie — who opposed both the US-Iran war and Trump's 'One Big Beautiful Bill' — made final appeals arguing Gallrein was a 'Washington swamp' candidate funded by outside forces. The result directly tests whether Trump can defeat a well-known incumbent in his home district and whether his approximately 82% primary endorsement win rate can hold against a deep-red incumbent with a personal following. NBC News, CNN, and ABC all deployed live results trackers for the evening.