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Francis J. "Frank" Underwood, Democrat from South Carolina's 5th congressional district who is House Majority Whip in season one, --Vice President of the United States in season two, and the 46th President of the United States in seasons three to five.
Claire Underwood, --Frank's wife who runs the Clean Water Initiative, a non-governmental organization, in season one before giving it up to become Second Lady of the United States in season two, and then United States Ambassador to the United Nations in season three and First Lady of the United States in seasons three to five.