Teamsters union leaders support Republicans despite members endorsing Democratic candidates

Sean O’Brien, president of the 1.3-million strong union, was also the first to speak at the Republican national convention in 2o24The powerful Teamsters union is backing Republican candidates in the 2026 election cycle even after members have voted to support their Democrat opponents.The 1.3 million-strong union’s president, Sean O’Brien, angered many members and union leaders in 2024 when he became the first union president to speak at the Republican national convention (RNC).