Students of the Watergate era (or those old enough to have lived through it) will recall the "dirty tricks" played by Richard Nixon's henchmen, most notably Donald Segretti. Segretti, who was hired by Nixon's deputy assistant, Dwight Chapin, was tasked with smearing Democrats, including senator and 1972 presidential candidate, Edmund Muskie of Maine. Among several "tricks," Segretti composed a fake letter on Muskie's letterhead falsely alleging that Sen. Henry "Scoop" Jackson (D-WA) had fathered a child with a 17-year-old girl. In 1974, Segretti pleaded guilty to three misdemeanor counts of distributing illegal, even forged, campaign literature and served four months...