 Armstrong coined the term "netroots", and was referred to as "The Blogfather" for having mentored many other famous bloggers such as Markos Moulitsas in their early years.He is credited as one of the architects of Howard Dean's 2004 grassroots presidential campaign, and bringing those tactics to campaigns globally.In 2005, Armstrong co-founded Vox Media with Markos Moulitsas and Tyler Bleszinski.