This paper tested the three levels of agenda building using an experimental design to identify possible causal relationships. This research contributes to the study and practice of political public relations by examining the process by which an issue is created and transferred to the public. Results indicate various support for agenda building including overall issue salience and issue attribute salience. The study also tested the compelling arguments hypothesis and found strong support for attribute salience contributing to overall issue salience. These findings demonstrate that contextual issue attributes increase issue salience for the public.