HIS BOOK WOULD have not been possible without the extraordinary support of a number of people.

I have to begin with my wife, Michelle. Being married to a senator is bad enough; being married to a senator who is also writing a book requires the patience of Job. Not only did Michelle provide emotional support throughout the writing process, but she helped me arrive at many of the ideas that are reflected in the book. With each passing day, I understand more fully just how lucky I am to have Michelle in my life, and can only hope that my boundless love for her offers some consolation for my constant preoccupations.

I want to express as well my gratitude to my editor, Rachel Klayman. Even before I had won my Senate primary race, it was Rachel who brought my first book, Dreams from My Father, to the attention of Crown Publishers, long after it had gone out of print. It was Rachel who championed my proposal to write this book. And it has been Rachel who’s been my constant partner in what’s been the frequently difficult but always exhilarating effort of bringing this book to completion. At each stage of the editorial process, she’s been insightful, meticulous, and unflagging in her enthusiasm. Often she’s understood what I was trying to accomplish with the book before I did, and has gently but firmly brought me into line whenever I strayed from my own voice and slipped into jargon, cant, or false sentiment. Moreover, she’s been incredibly patient with my unforgiving Senate schedule and periodic bouts of writer’s block; more than once, she’s had to sacrifice sleep, weekends, or vacation time with her family in order to see the project through.

In sum, she’s been an ideal editor—and become a valued friend.

Of course, Rachel could not have done what she did without the full support of my publishers at the Crown Publishing Group, Jenny Frost and Steve Ross. If publishing involves the intersection of art and commerce, Jenny and Steve have consistently erred on the side of making this book as good as it could possibly be. Their faith in this book has led them to go the extra mile time and time again, and for that I am tremendously grateful.

That same spirit has characterized all the people at Crown who’ve worked so hard on behalf of this book. Amy Boorstein has been tireless in managing the production process despite very tight deadlines. Tina Constable and Christine Aronson have been vigorous advocates of the book and have deftly scheduled (and rescheduled) events around the demands of my Senate work. Jill Flaxman has worked diligently with the Random House sales force and with booksellers to help the book make its way into the hands of readers. Jacob Bronstein has produced—for the second time—an outstanding audio version of the book in less than ideal circumstances. To all of them I offer my heartfelt thanks, as I do to the other members of the Crown team: Lucinda Bartley, Whitney Cookman, Lauren Dong, Laura Duffy, Skip Dye, Leta Evanthes, Kristin Kiser, Donna Passannante, Philip Patrick, Stan Redfern, Barbara Sturman, Don Weisberg, and many others.

Several good friends, including David Axelrod, Cassandra Butts, Forrest Claypool, Julius Genachowski, Scott Gration, Robert Fisher, Michael Froman, Donald Gips, John Kupper, Anthony Lake, Susan Rice, Gene Sperling, Cass Sunstein, and Jim Wallis took the time to read the manuscript and provided me with invaluable suggestions. Samantha Power deserves special mention for her extraordinary generosity; despite being in the middle of writing her own book, she combed over each chapter as if it were hers, providing me with a steady flow of useful comments even as she cheered me up whenever my spirits or energy were flagging.

A number of my Senate staff, including Pete Rouse, Karen Kornbluh, Mike Strautmanis, Jon Favreau, Mark Lippert, Joshua DuBois, and especially Robert Gibbs and Chris Lu, read the manuscript on their own time and provided me with editorial suggestions, policy recommendations, reminders, and corrections. Thanks to all of them for literally going beyond the call of duty.

A former staffer, Madhuri Kommareddi, devoted the summer before she entered Yale Law School to fact-check the entire manuscript. Her talent and energy leave me breathless. Thanks as well to Hillary Schrenell, who volunteered to help Madhuri with a number of research items in the foreign policy chapter.

Finally, I want to thank my agent, Bob Barnett of Williams and Connolly, for his friendship, skill, and support. It’s made a world of difference.