The genius of Kevin Spacey’s character, Congressman Francis Underwood, is revealed in his honest asides to the audience. Each aside builds the audience’s understanding of how a Psychopath in Charge thinks, strategizing his next move and forgiving his latest moral failing. His marriage to Claire is much more rare than a psychopath in Washington DC as Clare is also a psychopath with an arrangement and understanding with her husband. They tell each other everything (when needed and convenient) and they quest for power together. Nobody is safe from their relentless pursuit of power and influence.
Robin Wright’s character, Claire Underwood, is a perfect portrayal of a female psychopath in the work place, targeting other women and using anyone she can to get what she wants. She grooms her next victim by finding out everything she can about her. Then and only then does she go for the kill.
Although I have only watched the first season, I can tell you this marriage is doomed to fail eventually, as all alliances made with a psychopath are temporary.