I guess running (and turning around) New York City, which has an economy bigger than most states, doesn't count.
International economics is very, very different. He had no experience handling monetary policy yet his supporters seem to think he's an economic genius. That's a recipe for disaster that last materialized when Nixon dictated his own economic policy and that wasn't cleaned up till Reagan.
His social stances may split the party in two.
Other than that he's a fine man and I wish him well. But Rudy as GOP Nominee? We're looking for trouble.
Bigger than the state of Arkansas.