(AP Photo/Hasan Sarbakhshian, File) In this April 9, 2007 file photo, Iranian President Mahmoud Ahmadinejad speaks at a ceremony in Iran's nuclear enrichment facility in Natanz, 300 kilometers 186 (miles) south of capital Tehran, Iran. Major Asian importers of Iranian oil are thumbing their noses at American attempts to get them to rein in their purchases, dealing a blow to Washington's efforts to force the Middle Eastern country to curtail its nuclear program. F our years ago, when then-Senator Barack Obama was locked in a tough battle for the Democratic nomination for the presidency, he did something candidates for national office in the United States almost never do: He offered sense rather than sensationalism on Iran. Proclaiming in a primary debate his willingness to meet with Iran’s reviled president, Mahmoud Ahmadinejad, was not as radical as it seemed; indeed, every U.S. president since Iran’s 1979 revolution has sought negotiations with Tehran. But in the context of a country...