Abstract
In a digital media environment, the arguments disseminated by non-mainstream, web-based political groups such as bloggers are playing an active role in shaping public opinion-and challenging mainstream news coverage of particular issues or events. This paper analyzes an instance in which bloggers influenced the deliberative process surrounding the controversial Arizona 9/11 Memorial. Findings indicate that bloggers are moving from the political margins to take an active role in countering mainstream media reports, as well as creating and disseminating their own arguments to constituencies. As news organizations are challenged, their reactions will influence how scholars understand the nature of argumentation.