Incumbent John Rutherford maintains a commanding lead in the Florida 5th Congressional District Republican primary, set for August 18, 2026, reflecting traders' assessment of his established position in a solidly Republican district. As a five-term representative and former Jacksonville sheriff, Rutherford benefits from substantial fundraising, prior primary victories, and recent endorsements including from the U.S. Chamber of Commerce. Challenger Mark Kaye, a conservative podcaster and radio host, has drawn limited support and trails significantly in resources. Other declared or write-in candidates face even steeper barriers to visibility or ballot traction. An upset would require an unexpected late surge in turnout or a major shift in voter priorities before primary day.