Whether there was any animosity between Mamie Eisenhower and Richard Nixon is unknown. But what is true, Dwight D. Eisenhower's grandson David Eisenhower married Richard Nixon's daughter Julie Nixon in 1968.
The second lowest IMDB user rating for an episode of the series and the first to ever fall below at 4/10. The lowest and second episode being "The Auteur" from season 12.
In the grammatical sense of the phrase "future perfect", it refers to a tense of verbs expressing expected completion in the future, in English exemplified by will have done.