Diplomacy: After a weekend of cavorting in Colombia, the White House was caught flat-footed by Argentina's takeover of a big oil company whose loss will hike gas prices, harm Spain and slam U.S. investors. Lucky us. Never was a response to a global outrage more mealy-mouthed than the one from the U.S. after Argentina's President Cristina Fernandez de Kirchner, standing under a portrait of Evita Peron, announced a brazen grab for YPF, the Argentine oil company that's 57% owned by Spain's Repsol. Markets fell, world leaders denounced the violation of contracts and economically battered Spain rallied European Union support. But...