True, but you have to have some experience outside of theoretical economics modeling, or legislating, to do so. That's the problem with most legislators. They've never run a business, or a government - small or large.
Why some people overlook the obvious fact that a person should have at least some prior experience for a job as important as the presidency, is beyond me. You would demand an adequate resume from an applicant for any other position on earth, but when it comes to the US presidency, some people just throw common practices and common sense right out the window.
And guess what? It's not the president's job to create private sector jobs. It's his job to run the executive branch of the federal government, and to be the leader of the country. Beyond that, all he can do to affect the overall economy, is champion free market capitalism, and use the power of his office to get government out of the way of the private sector.
Most successful legislators have turned out to be awful Executives because they confuse "getting something done" for "doing the right thing". They confuse consensus for leadership