"A new King! A new age! Of peace and hope, etc. etc. And I'm still here… for my sins."

Yeah, but where's the drama of a general election when he was able to oust a sitting president and replace him from the position of Majority Whip?

Season 3 has to be international in scope. Underwood clearly has Washington sewn up so where would the drama be? And that's good because Ian McShane as a Tony Blair-ish PM, but more conniving and manipulative, as the US/UK march to some war would be a sight to see.