Much has been written about the historic nature of the Obama campaign. The multi-year, multi-billion dollar operation elected the nation's first black president, raised and spent more money than any other election effort in history, and built the most sophisticated voter targeting technology ever before used on a national campaign. But what is missing from these accounts is an understanding of how Obama for America organized its formidable army of 2.2 million volunteers -- over eight times the number of people who volunteered for democratic candidates in 2004. Unlike previous field campaigns that drew their power from staff, consultants, and paid canvassers, the Obama campaign's capacity came from unpaid local citizens who took responsibility for organizing their own neighborhoods months--and even years--in advance of election day. In so doing, Groundbreakers argues, the campaign enlisted citizens in the often unglamorous but necessary work of practicing democracy. How did they