Three decades ago, two young lawyers worked behind the scenes, on opposite sides of the political aisle, to investigate the corruption and deceit that became known simply as "Watergate." One, an ideologically liberal Democrat who had recently graduated from Yale Law School, served as a member of the impeachment inquiry staff advising the House Judiciary Committee during the scandal. The other, a wise-beyond-his-years conservative Republican Southerner with a Juris Doctorate from Vanderbilt University, served as co-chief counsel to the Senate Watergate Committee. Little would anyone suspect in 1974 that these two could face each other for the presidency in 2008....