Presidents come from all kinds of backgrounds and experiences, and some come ill equipped to deal with foreign policy and or domestic issues.
It is often said that learning on the job is the best experience, but that puts the nation at greater risk.
So the question arises: Since World War II, what Presidents came to office fully qualified to take the reigns of power?
This judgment is not one of approval or disapproval of the President and his record, but simply his qualifications when he took the oath of office.
It is clear that three Presidents came to office very qualified to be President, and they would be, chronologically, Lyndon B. Johnson, Richard Nixon, and George H. W. Bush!
Harry Truman was ill prepared; Dwight D. Eisenhower had never taken an interest in politics; John F. Kennedy was very challenged in his first year in office; Gerald Ford had years of experience but no real ambition to be President; Jimmy Carter had limited experience in government, as did Bill Clinton, and George W. Bush, as being governors of southern states did not prepare them for national leadership; Ronald Reagan had a very narrow view of national government and its importance; and Barack Obama had limited experience in national affairs, having only served four years in the US Senate.
On the other hand, Lyndon B. Johnson had been in government for thirty years and was a master legislative strategist, although foreign policy was certainly not his forte.
Richard Nixon had been Vice President for eight years, as was also with George H. W. Bush, and those years plus foreign policy expertise set them up well to be President.
Hillary Clinton is, without a doubt, the best equipped since the elder Bush to be President, as her years in the White House with her husband; her Senate years; and her four years as Secretary of State, even with problems, made her known worldwide, and she has the respect of foreign governments. She is likely to be more activist in domestic affairs than her husband, which would also be a plus!