During our last great war, the Cold War, no foreign policy novice won the presidency, except for Carter in the anomalous Watergate election of 1976. The only foreign policy novices elected in the last half-century -- Bill Clinton and George W. Bush -- won the presidency during our holiday from history between the fall of the Soviet Union and 9/11.
In any circumstance, it is fairly audacious for any freshman senator to even think of the presidency. When freshman Sen. John F. Kennedy began his preparation for 1956, he was really seeking the vice presidency. And, unlike Obama, he had already served three terms in the House, which in turn had followed a celebrated military tour in the Pacific in World War II.
In 1956, Kennedy was preparing for a serious presidential run in 1960. Obama should be thinking ahead as well -- using '08 to cure his problem of inexperience. Run for the Democratic nomination and lose. He only has to do reasonably well in the primaries to become such a compelling national figure as to be invited onto the ticket as vice presidential nominee. If John Edwards, the runner-up in '04 did well enough to be made running mate, a moderately successful Obama would be the natural choice for '08.
Then, if the Democrats win, he will have all the foreign policy credentials he needs for life. Even if the ticket loses, assuming he acquits himself reasonably well, he immediately becomes the presumptive front-runner in the next presidential cycle. And if by some miracle he hits the lottery and wins in '08, well, then it is win-win-win.
He's a young man with a future. But the future recedes. He needs to run now. And lose. And win by losing.