WASHINGTON - The Obama administration is leaning toward making a major diplomatic overture to Iran before the country's presidential elections in June. This initiative could come in the form of a letter from President Obama to Supreme Leader Ayatollah Ali Khamenei, according to two senior European diplomats who have met in recent weeks with key State Department officials crafting a new US policy toward Iran. The letter would be aimed at initiating talks over the Iranian nuclear program and Iran's role in neighboring Iraq and Afghanistan, the diplomats said, speaking on condition of anonymity because of the sensitivity of the...