Why experience is important in a President.

For Obama, Steep Learning Curve as Chief in War:

While Mr. Obama took three sometimes maddening months to decide to send more forces to Afghanistan, other decisions as commander in chief have come with dizzying speed, far less study and little public attention.

He is the first president in four decades with a shooting war already raging the day he took office — two, in fact, plus subsidiaries — and his education as a commander in chief with no experience in uniform has been a steep learning curve. He has learned how to salute. He has surfed the Internet at night to look into the toll on troops. He has faced young soldiers maimed after carrying out his orders. And he is trying to manage a tense relationship with the military.

Nobody expects every President to be a military expert, but he or she should have some executive experience, and understanding how the military works is definitely a big help.