With the proliferation of digital media and other forms of technologically mediated communication, this article argues that critical multimodal pedagogical approaches to public writing--particularly through interrogating mundane, everyday texts--have the potential to engage students with advocacy and its role in shaping public discourse. In this article, we propose a pedagogy that views multimodal composition "as" advocacy. Because "all" texts are embedded with advocacy, encouraging students to recognize their own advocacy practices, and teaching them to carefully approach how they construct texts, we argue, may better prepare our students to be more social-justice minded public writers and rhetors in the future.