Today in The Post, I have a brief interview with actress Patty McCormack, who plays Pat Nixon in “Nixon/Frost,” opening next Friday. McCormack received an Oscar nomination as Best Supporting Actress for Meryn LeRoy’s“The Bad Seed” (1956), which will be shown tomorrow at the Walter Reader Theater as part of a three day series of movies about homicidal childen. It’s also available on DVD with a hilarious commentary track by McCormack and Charles Busch.