Kentucky Primary Eve: Trump-Backed Gallrein Leads 7-Term Rep. Massie 48.3% to 43.1% in Final Poll; Most Expensive House Primary in US History

On the eve of the May 19, 2026 Kentucky Republican primary, the final Quantus Insights poll (908 likely GOP primary voters) showed Trump-backed challenger Ed Gallrein — a farmer and former Navy SEAL — leading seven-term incumbent Rep. Thomas Massie 48.3% to 43.1%. The race became the most expensive US House primary in history, with over $32 million in total ad spending by May 17. Trump held a rally in Kentucky in March specifically endorsing Gallrein. Pro-Israel interest groups spent over $9 million against Massie, who has been a consistent voice against foreign aid and US interventionism — positions that earned both Trump's ire over budget reconciliation votes and opposition from pro-Israel donors who otherwise fund MAGA-aligned candidates. Massie made final appeals to Kentucky voters on May 17, arguing Gallrein was a tool of the 'Washington swamp.' The Kentucky race became a bellwether for the 2026 primary cycle, testing whether Trump can defeat a well-known incumbent in his home district with an outside-funded challenger and whether his ~82% primary endorsement win rate can hold against a deep-red incumbent with a personal following.