I've asked the rudy supporters, but I don't know of any politician who has been elected president after the highest elected office they've held was mayor.
We've had military men with no experience, but has someone ever gone from mayor to president - and 6 years after they last served in public office?
No, but it's worth noting that NYC, if it were it's own state, would be equal in population size to Georgia and bigger then Massachusetts or Arizona.
How many people does New York City have? More than New Mexico? More than Wyoming? How many states have less of a population than New York City and is as diverse?