In “House of Cards,†Kevin Spacey, left, and Robin Wright play a husband-and-wife political team. Wright plays Claire, who runs a charity but also works behind the scenes helping Democratic Majority Whip Francis Underwood climb the greasy pole of Washington power. The on-screen couple’s agendas and emotional loyalty may at times go askew, Wright notes, “and yet they know they have each other’s back.†(Kirk McKoy / Los Angeles Times)