A Congressman works with his equally conniving wife to exact revenge on the people who betrayed him.
Starting on season 4, a new terrorist threat appears as the Islamic Caliphate Organization (ICO), a not so subtle reference to the real life Islamic State of Iraq and Syria (ISIS).
Francis Underwood:
There are two kinds of pain. The sort of pain that makes you strong, or useless pain. The sort of pain that's only suffering. I have no patience for useless things.
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