In this episode, I interview Hahrie Han, Professor of Political Science, and Faculty Director of the P3 Research Lab at Johns Hopkins University. Professor Han specializes in the study of civic and political participation, social movements, collective action, and organizing, particularly as it pertains to democratic revitalization. In our interview, we discuss her book Groundbreakers: How Obama's 2.2 Million Volunteers Transformed Campaigning in America. Building a grassroots field operation is vital for any candidate running for any office.