Book excerpt: The first edition of Get Out the Vote! broke ground by introducing a new scientific approach to the challenge of voter mobilization and profoundly influenced how campaigns operate. In this expanded and updated edition, the authors incorporate data from more than one hundred new studies, which shed new light on the cost-effectiveness and efficiency of various campaign tactics, including door-to-door canvassing, e-mail, direct mail, and telephone calls. Two new chapters focus on the effectiveness of mass media campaigns and events such as candidate forums and Election Day festivals. Available in time for the core of the 2008 presidential campaign, this practical guide on voter mobilization is sure to be an important resource for consultants, candidates, and grassroots organizations. Praise for the first edition: "Donald P. Green and Alan S. Gerber have studied turnout for years. Their findings, based on dozens of controlled experiments done as part of actual campaigns, are summarized in a slim and readable new book called Get Out the Vote!, which is bound to become a bible for politicians and activists of all stripes." —Alan B. Kreuger, in the New York Times "Get Out the Vote! shatters conventional wisdom about GOTV." —Hal Malchow in Campaigns & Elections "Green and Gerber's recent book represents important innovations in the study of turnout."—Political Science Review "Green and Gerber have provided a valuable resource for grassroots campaigns across the spectrum."—National Journal