RORY: Nixon’s bad seed.
Bad seed, an American expression referring to someone who is evil or unprincipled by their nature, “born bad”.
The expression gained widespread notoriety through the 1956 psychological thriller The Bad Seed, directed by Mervyn LeRoy and starring Patty McCormack in the title role. It is based on the 1954 play of the same name by Maxwell Anderson, which in turn was based on the 1954 novel by William March. The film is about a sociopathic little girl, and was a hit at the box office, receiving positive reviews from critics.
Rory suggests that Paris was born from the “bad seed” of disgraced president Richard Nixon, to explain why she is such a bad president herself.
The Annotated Gilmore Girls 