The 2004 Florida Senate race remains a unique turning point in state political history

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: When incumbent Bob Graham declined to seek a fourth term in 2004, Florida faced its first open Senate election in three decades. The resulting contest between Mel Martínez and Betty Castor became the tightest Senate race in the nation that year, leaving a lasting mark on the state's electoral landscape.

The 2004 election cycle in Florida was defined by the rare departure of a long-serving incumbent. Bob Graham, who had held the seat since 1987, chose to pursue a presidential bid rather than defend his Senate position. This decision triggered the first open race for the seat since 1974. The Republican primary featured a crowded field, including former U.S. representative Bill McCollum and businessman Doug Gallagher, but Mel Martínez ultimately secured the nomination with the backing of the Bush administration.

On the Democratic side, former education commissioner Betty Castor defeated U.S. representative Peter Deutsch to earn her party's nomination. The general election held on November 2, 2004, proved to be an exceptionally close contest. Martínez emerged victorious with 49.4 percent of the vote, narrowly edging out Castor, who finished with 48.3 percent. This margin made it the most competitive Senate race in the United States during the 2004 election cycle.

The campaign was marked by significant shifts in voter behavior across several Florida counties. Notably, Duval, Osceola, and Okeechobee counties flipped from Democratic to Republican support during this cycle. The election also serves as a historical marker; as of 2026, it remains the last instance in which a sitting Florida senator chose not to run for re-election. The race was further shaped by the earlier withdrawal of Republican candidate Mark Foley, who exited the contest in September 2003 amid personal controversy.

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