Senator Barack Obama, the visiting Democratic presidential candidate who is leading the race for the White House, told The Jerusalem Post on Wednesday evening that, if elected president, he would do "everything in my power" to stop Iran from obtaining nuclear weapons. Asked about concerns that the Iranians would abuse his stated readiness for "tough diplomacy" to play for time and keep moving ahead toward the bomb, Obama said that his "willingness to negotiate" had "very clear and direct goals" and "a sense of urgency." So "if the Iranians fail to respond, we've stripped away whatever excuses they may have,...