The International Association of Fire Fighters (IAFF) announced Thursday that it will not endorse a candidate in this year’s presidential election. IAFF has previously advocated for Democratic candidates and supported President Joe Biden early in 2020 but has shifted its stance by choosing not to endorse any candidate in the upcoming presidential election between Vice President Kamala Harris and former President Donald Trump. Edward Kelly, president of the IAFF, cited a narrow 1.2-point vote margin by the union’s executive board as the reason for not endorsing a candidate. “Over the past year,…