Public sector unions play a vital role in political advocacy by representing the interests of government employees. They engage in collective bargaining, lobbying, and mobilizing members to influence legislation and public policy. Unions often advocate for worker rights, fair wages, and improved working conditions, making them key players in political discourse. By endorsing candidates and contributing to campaigns, they can significantly impact elections and promote policies that align with their members' interests. Overall, their political activism can help shape a more equitable public sector.