The YouTube and the 2008 Election Cycle in the United States Conference took place April 16-17, 2009 at the University of Massachusetts Amherst. The conference brought together political and computer scientists to explore the electoral impact of user-created YouTube technologies and to demonstrate new technical and analytic opportunities associated with new media technologies and politics. The conference proceedings includes copies of all papers presented at the conference as well as abstracts of all posters and keynote presentations.