Incumbent Republican Brian Mast holds a strong position in Florida’s 21st Congressional District ahead of the November 3 general election, supported by substantial fundraising advantages, prior reelection margins exceeding 20 points, and a new congressional map enacted in May 2026 that increased the district’s Republican lean. Forecasters rate the race Solid or Safe Republican, reflecting the district’s voter registration patterns and Mast’s incumbency in a Treasure Coast and northern Palm Beach County area. Democratic nominee James Martin advanced narrowly from an August primary but trails significantly in available resources and faces structural headwinds in a district with no Democratic representation in over a decade. Trader consensus reflected in current pricing aligns with these fundamentals and limited recent polling showing Mast ahead, though the two-day window before ballots close leaves room for last-minute shifts in turnout or undecided voters.