Libby Lassiter was a former First Lady of the United States. She was the widow of former wife of President Owen Lassiter. She bares a resemblance to Nancy Reagan, the former First Lady in real life.

Josh Lyman and Toby Ziegler refer to her as "lunatic" and "Lady Macbeth".

She had only one appearance in the series, in The Stormy Present.

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