"FOR HUNDREDS OF YEARS, people from every corner of the planet have flocked to New York City for the reason Frank Sinatra immortalized: to prove they could "make it." The allure, the prestige, the struggle to survive, breeds a brand, an image of the city that ripples out to the rest of the world. Sinatra sang about proving himself to himself. "If I can make it there, I'll make it anywhere." New York was the yardstick. New York has indeed become a global yardstick--for artists, businesspeople, and dreamers of all stripes. He was a lawyer in New York? He must be good. Doesn't matter if he was the worst lawyer in the city. If you can make it in New York, people assume that you can make it anywhere. The yardstick the public uses when judging a presidential candidate, it turns out, is not how much time the candidate has in politics. "It's leadership qualities," explains the presidential historian Doug Wead, a former adviser to George H. W. Bush and the author of 30 books on the presidents. Indeed, polls indicate that being "a strong and decisive leader" is the number one characteristic a presidential candidate can have. The fastest-climbing presidents, it turns out, used the Sinatra Principle to convey their leadership cred. What shows leadership like commanding an army (Washington), running a university (Wilson), governing a state for a few years--even if you started out as an actor (Reagan)--or building a new political party and having the humility to put aside your own interests for the good of the whole (Lincoln)? Dwight D. Eisenhower led the United States and its allies to victory against Hitler. He had never held an elected office. He won by a landslide with five times the electoral votes of his rival. "If he can make it there, he can make it anywhere," US voters decided."