That would make DC the 58th State according to Zero.
It would make more sense to split mexifornia first.
Actually, it would be the 61st state, since what Obama actually said was that he had been campaigning in 57 states, he had one left to go, but that he was not going to be able to make it to Alaska or Hawaii (so obviously he meant to say 47). But anyway, that would make DC the 61st state then.