How did a candidate with no political experience have the ability to convince voters and become president? Did any significant programs/legislation pass(for better or worse). Was he able to win reelection? Did he cause more damage or beneficial things economically, socially, or politically? What kind of leadership background he have?
Do you mean any leader who has no experience in an actual political office? Because political experience is a very broad subject. I can be politically experienced just from running donation teams. If you mean office then sure, pick any general from the US military that became president and read about their terms. Grant, Eisenhower, etc.. Grant was not known to be a great president.