The International Association of Fire Fighters (IAFF), a major union representing over 350,000 firefighters and emergency workers, has announced it will not endorse any candidate in the 2024 U.S. presidential election. This decision, made with a narrow 1.2% margin by the IAFF's executive board, is seen as a setback for Vice President Kamala Harris, who had been relying on union support after replacing Joe Biden on the Democratic ticket. The IAFF's choice to stay neutral follows a similar decision by the Teamsters Union, marking a notable shift as both unions previously supported Biden in 2020. The IAFF stated that this decision was made to preserve unity within the union and to effectively advocate for its members' interests. Both the Harris and Trump campaigns had actively sought the union's endorsement, with figures like Harris's running mate Tim Walz and Trump's running mate JD Vance addressing the union's members. Despite the non-endorsement from some major unions, Harris still retains backing from other significant labor groups like the AFL-CIO and United Auto Workers.