[ Hillary did not take the office in a Constitutional sense.]
Since when did a klinton pay ANY attention to the Constitution?
Only when it is to their benefit, which in this case it is (although, hilary! will never be president - too unlikable, imho)
So what are you going to do? Are you going to take a case to the US Supreme Court to argue that a hypothetical Pres. Hillary cannot run for a second term of office because she & her husband claimed a co-presidency? Let me know when Scalia & Thomas stop laughing.