Many of America's largest labor unions have rallied behind Vice President Kamala Harris in her bid for the Democratic presidential nomination, reflecting a strong shift from support for President Biden. The American Federation of Labor and Congress of Industrial Organizations (AFL-CIO) and several other unions, including the Service Employees International Union (SEIU) and the American Federation of Teachers (AFT), have endorsed Harris, praising her as a champion for working people and a vital ally in their fight for labor rights. Union leaders highlighted her record of supporting labor initiatives and her potential to build on the Biden-Harris administration's pro-labor legacy. However, some notable unions remain uncommitted, suggesting that Harris still needs to win over certain factions within the working class. The swift consolidation of support signals Harris as the clear front-runner in the upcoming Democratic primary. As the Democratic convention approaches, the urgency for labor unions to unify behind a candidate to challenge Trump has become increasingly apparent.