This book exists in large part because of the generosity of friends, scholars, and institutions. Financial assistance was provided by fellowships from the Julian Park Fund of the State University of New York at Buffalo, the Indiana Historical Society, the Henry E. Huntington Library, the Everett M. Dirksen Congressional Research Center, the Mark DeWolfe Howe Fund of the Harvard Law School, the Graduate Student Council of Harvard University, the Charles Warren Center of Harvard University, and the Department of History of Harvard University. A fellowship from the Mrs. Giles Whiting Foundation enabled me to complete the dissertation on which this book is based. Frank Smith of Cambridge University Press and the anonymous readers who evaluated the book for the Press have been patient and helpful in the transformation of the manuscript into the final product.
I benefited immeasurably from the assistance of research librarians and archivists at roughly thirty-five repositories across the country. Limitations in space prevent me from mentioning all of them, but I would like to note in particular the helpfulness of the staffs of the manuscripts division of the Library of Congress and the special collections division of the Henry E. Huntington Library. Also, at the Illinois State Historical Library, Mr. Thomas F. Schwartz, now the State Historian of Illinois, offered much valuable advice and made available to me unpublished Lincoln material. Mary-Jo Kline at the John Hay Library of Brown University came to my rescue in a last-minute search for photographs.
Many scholars have assisted me in the final preparation of the book. I must thank in particular Jeffrey P. Moran, an immensely talented historian and a devoted friend. Jeff read early drafts of many chapters, and he is more than likely responsible for any well-turned phrase that somehow found its way into the final version. Thomas J. Brown and Heather Cox Richardson were also generous with their time and editorial assistance. Their incisive critiques of the manuscript have saved me from many missteps. Special thanks are also due to Michael Green, who lent me valuable notes and shared with me his own work in progress on the Republican party during the Civil War. Many historians have offered valuable comments on parts of the book or on papers derived from it. These include Guyora Binder, David W. Blight, Frederick J. Blue, Paul Finkelman, Sally Hadden, Laura Kalman, David E. Kyvig, Michael A. Morrison, Donald G.