Paul Brandus, Market Watch - History suggests that there is no link between success in the business world and success in the White House. In fact—and surprisingly—the opposite appears to be true. Presidents with business backgrounds rank poorly among historians and voters, who have turned several of them out of office for poor performance. In fact, since 1900, the only president who is today considered great—Harry Truman—was a failed businessman.
In recent years, two separate, well-respected surveys of historians, political scientists and presidential scholars have ranked the presidents in order of greatness. What did the Siena College Research Institute and American Political Science Association each conclude? That in the aggregate, presidents who first worked in the business world before entering politics, tend to rank in the bottom third of all presidents.