Among a slew of new books joining the already crowded scholarship about Nixon and his activities is “Chasing Shadows: The Nixon Tapes, the Chennault Affair, and the Origins of Watergate,” by University of Virginia historian Ken Hughes. Hughes, who helps run the Miller Center's Presidential Recording Program at the University of Virginia, said that a year before the Watergate break-in, Nixon's aides drew up plans to cover up a crime Nixon committed during his 1968 campaign.