This dissertation explores various factors that influence advocacy. When people seek support for a cause, they typically present the strongest arguments they can muster. The current research departs, however, in identifying the conditions under which (and processes through which) presenting weak arguments can stimulate greater advocacy. Chapter 1 examines this ironic predictor of advocacy. This research also explores the impact of people's lay theories about attitudes on advocacy. People vary in the extent to which they believe attitudes are fixed (entity theorists) or malleable (incremental theorists). Results indicate that entity theories of attitudes simultaneously motivate and demotivate willingness to try to persuade others. Chapter 2 explores the contradictory ways in which these lay theories affect advocacy.