The biography of America's hottest political superstar, Barack Obama—a man poised on the threshold of greatness.

Barack Obama's meteoric rise from Hawaii high schooler to exemplary Harvard Law School student to well-groomed politico to history-making presidential candidate is the stuff of legend. Since his headline-grabbing speech at the Democratic National Convention in 2004, Obama has come to represent the promise of unity among groups of all types of Americans—blacks and whites; Democrats, Republicans, and moderates; the young and the old; the upper, middle, and lower classes.

Veteran Chicago Tribune journalist David Mendell has covered Obama since the beginning of the candidate's campaign for the Senate. In Obama: From Promise to Power, the author offers a revealing, detailed portrait based on intensive research and exclusive interviews with Obama's closest aides, mentors, political adversaries, and family—most notably his charismatic wife, Michelle. It is an eye-opening look at the evolution of a brilliant politician whose name has become a catchphrase for hope in a politically jaded society.

David Mendell, author of Obama: From Promise to Power, has been writing about politics and urban issues for the Chicago Tribune since 1998. Mr. Mendell lives in Oak Park, Illinois.