Now Richard Nixon was never formally impeached by the House of Representatives because he resigned first under mounting pressure from the Watergate scandal.
It was of course after Watergate with Richard Nixon, and at that time period, then-president Ford decided to give a pardon for Nixon with the idea of kind of moving forward and moving on to heal the nation.
Jimmy Carter was elected president barely two years after the law-breaking and cover-ups of the Watergate scandal forced President Richard Nixon to resign.