Political parties and interest groups influence public policy in the United States in several ways. Political parties recruit candidates, organize elections, and help govern by uniting diverse interests. Interest groups bring people together around common goals and try to influence policy through lobbying, research, and mobilizing members. Political action committees (PACs) raise and distribute funds to candidates and gain influence through their size, funding, organization, expertise, and information. The public policy process involves identifying issues, setting agendas, forming policies, adopting policies through legislation, implementing policies, and evaluating effectiveness.