By mid-2015, the Obama presidency will be entering its final stages, and the race among the successors in both parties will be well underway. And while experts have already formed a provisional understanding of the Obama administration's foreign policy goals, the shape of the "Obama Doctrine" is finally coming into full view. It has been consistently cautious since Obama was inaugurated in 2009, but recent events in the Middle East, Eastern Europe, and the Far East have led an increasingly large number of foreign policy experts to conclude that caution has transformed into weakness. In The...