It’s the subject that separates the men from the boys. Or, to put it more fairly in these politically correct days, the winners from the also-rans. Want to prove to the voters that you should have access to The Button? You’d better have a good grasp of the globe. You’d better be able to explain how the U.S. will interact with the world when you’re calling the shots. And as the heir-in-waiting for Obama’s Oval Office, Hillary Clinton owes America a glimpse at her stance on foreign policy. Instead, we hear mostly silence. In an era where the president makes...