Advocacy campaigns mobilize people around a cause: sign petition (policy change), donate to nonprofit, switch to sustainable brand, vote for candidate. Goal is behavioral change (action) driven by persuasive messaging and strategic execution. Key elements: clear objective (what's success?), target audience (who do we move?), messaging (why should they care?), channels (email, social, street), calls-to-action (what specifically?), measurement (did it work?).