Six days before voters head to the polls in Kentucky’s 4th Congressional District, a new survey shows President Trump’s handpicked challenger has taken the lead in a race that has already shattered spending records for a U.S. House primary.
Ed Gallrein, the Trump-endorsed veteran and farmer challenging Rep. Thomas Massie, now leads 48.3% to 43.1% among likely Republican primary voters, according to a Quantus Insights poll released Tuesday. Another 7.6% remain undecided. The May 19 primary is less than a week away.
The shift is dramatic. In April, Quantus had Massie ahead 46.8% to 37.7%. Gallrein has gained more than 10 points in roughly five weeks while Massie has dropped nearly four.
Quantus Insights laid out the survey details: The poll was conducted May 11-12 among 908 likely Republican primary voters in Kentucky’s 4th Congressional District, with an effective sample of 903 and a weighted margin of error of plus or minus 3.3 percentage points. On the initial ballot, Gallrein led Massie 48.3% to 43.1%, while 7.6% of voters were undecided.
The leaner question moved the race further toward Gallrein. Among voters who were not completely sure, 52.4% said they leaned toward Gallrein, 23.4% leaned toward Massie, and 24.1% remained undecided. When firm support and leaners are combined, Quantus places Gallrein at roughly 52.8% and Massie at roughly 45.1%, with about 2.1% still undecided.
This is one poll, but the direction of movement, combined with the sheer volume of money flowing into the district, suggests this race has become a full-scale proxy fight over what it means to be a Republican in the Trump era.
The race has drawn more than $25.6 million in ad spending, making it the most expensive U.S. House primary in history. Outside groups, including Trump-aligned organizations and candidate campaigns, are engaged in an intense advertising war that reflects the national stakes of the contest.
On the pro-Gallrein side, major contributors include MAGA KY ($5.6 million), the Republican Jewish Coalition ($4 million), AIPAC’s United Democracy Project super PAC ($2.6 million), and Gallrein’s own campaign ($1.3 million). The Massie campaign has spent $5.6 million, while Kentucky 4th PAC added $4.6 million and Kentucky First PAC contributed $920,000.
A generational divide is evident in the race: younger voters under 55 favor Massie by margins ranging from 17 to 56 points depending on age bracket, but voters aged 56 and older support Gallrein by margins of 18 to 35 points. In a low-turnout May primary, the older electorate could be decisive.
At a Pendleton County Republican dinner, Gallrein emphasized Trump’s personal endorsement, stating that the president had asked him to serve in Congress. He accused Massie of aligning with liberal elites and radical Democrats, positioning himself as the candidate who would work with Trump rather than against him. Massie countered that he agrees with President Trump on 90% of issues but refuses to act as a rubber stamp when disagreements arise.
The vote is set for Tuesday, May 19.