Mitt Romney recently said: "I'd like to have a provision in the Constitution that in addition to the age of the president and the citizenship of the president and the birth place of the president being set by the Constitution, I'd like it also to say that the president has to spend at least three years working in business before he could become president of the United States."
Look at the 20th-century presidents who have been successful businessmen: Warren G. Harding was a successful publisher, turning around the failing Marion Daily Star; Herbert Hoover was a very successful mining executive; Jimmy Carter turned around a failing peanut business; and George W. Bush made millions in his five years as general managing partner of the Texas Rangers baseball franchise. None of them are considered our most successful presidents.
In contrast, most of our greatest presidents were professional politicians: Franklin Roosevelt, Theodore Roosevelt, Lyndon Johnson. Dwight Eisenhower, of course, had a successful military career.
Interestingly, Harry S. Truman was a professional politician who had first tried his hand at business, a haberdashery, and went bankrupt.
What about Ronald Reagan? Well, he was an actor, on screen and in politics.