Part of the problem in translating the series is that the BBC version took advantage of the British class system in a way that doesn't really have a parallel in American life. The (British) Urquhart comes from an establishment family ("We were defenders of the English throne before your family was ever heard of" - speaking to the English King.) Frank Underwood, by way of contrast, seems to have arrived from nowhere out of the Carolina swamps - relying - if anything - on his wife's family money.
Haven't watched the British season, although now that I finished Season 2 already, I might have to. Very good point about classes structures, although I would offer that we do have class structures in the US. They aren't based on lineage, they are instead built and maintained through power and money. It's an ostensible meritocracy (Frank needed Claire's money and the POTUS and Frank needed Tusk), but as the show illustrates, the best men do not always win. To borrow a quote from Game of Thrones, all that matters is the climb.
Totally unrelated, but I'm curious about Claire's breakdown on the stairway toward the end of the season. She's just as calculating and cold as Frank, so I'm wondering if her crying has more to do with her frustration at not being able to control the situation (at least at that time) It works out, in the end...
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Another thing that threw me way off - what were the writers trying to accomplish during the scene where Claire and Meechum are drinking when Frank comes in and shortly after they all start kissing each other?
Sex to both Frank and Claire is about power, and little else. Sure, Claire had a relationship with the photographer, but sacrificed whatever feelings she may have had in the service of gaining more power and influence.
So I guess I read that scene as a sort of symbolic gesture to bring Meechum into the fold, so to speak. I've no idea if that makes sense...