Until President Gerald Ford pardoned former president Richard Nixon for the Watergate scandal, most members of the public probably paid little attention to the president's use of the clemency power. Ford's highly controversial pardon of Nixon, however, ignited such a firestorm of protest that, fairly or unfairly, it may have cost him the presidency in 1976. Ever since, presidential pardons have been the subject of increased scrutiny and the focus of news media with a voracious appetite for scandal.

This first book-length treatment of presidential pardons in twenty years updates the...