episode of the Nickelodeon series Hey Arnold! The same year, she was cast in a lead role in the short-lived Center of the Universe. She also had a supporting role in David O. Russell's I Heart Huckabees (2004). In January 2006, Smart joined the cast of the Fox series 24, playing the mentally unstable First Lady of the United States, Martha Logan, to actor Gregory Itzin's President Charles Logan. She received back-to-back Emmy nominations for Outstanding Supporting Actress in a Drama Series and Outstanding Guest Actress in a Drama for the role in 2006 and 2007. She also appeared in several films between 2006 and 2010, including the Curtis Hanson drama, Lucky You (2007), opposite Drew Barrymore; Youth in Revolt (2009); and the independent comedy Barry Munday (2010). Smart won her third Emmy Award for Best Supporting Actress in a Comedy Series for portraying Samantha's overbearing mother in the sitcom Samantha Who?, opposite Christina Applegate, which she played from 2007 to 2009. She later was cast as Hawaii Governor Pat Jameson during the first season of the CBS-TV remake of Hawaii Five-0. 2010s: Fargo and Watchmen In 2012, Smart was nominated for a Primetime Emmy Award for Outstanding Guest Actress in a Drama Series for her role in Harry's Law. She then had a supporting role in the Lifetime film Call Me Crazy: A Five Film (2013). In 2015, Smart starred in the second season of the FX television series Fargo, portraying Floyd Gerhardt. Floyd's husband heads Fargo's most prominent organized crime syndicate, and she is forced to take over after her husband suffers a debilitating stroke. She later finds herself having to lead the Gerhardt dynasty and deal with her sons, who are vying to replace their father. For her performance, Smart won the Critics' Choice Television Award for Best Supporting Actress in a Movie/Miniseries, and was nominated for the Primetime Emmy Award for Outstanding Supporting Actress in a Limited Series or Movie. She worked with Hawley again on Legion, in which she played Melanie Bird, a therapist who works with the protagonist David Haller. In 2016, Smart had a role in the thriller The Accountant, opposite Ben Affleck, Anna Kendrick, and John Lithgow. In 2018, Smart played a guardian angel, to co-star Candace Cameron, in the Hallmark Channel television film A Shoe Addict's Christmas, which aired Sunday November 25, 2018. In 2019, Smart portrayed Laurie Juspeczyk in the