KERMAN, Iran-Iran's president on Wednesday urged Barack Obama to accept a nuclear fuel swap deal, warning the U.S. leader will miss a historic opportunity for improved cooperation from Tehran if the offer is rejected.Mahmoud Ahmadinejad's remarks came a day after U.S. Secretary of State Hillary Rodham Clinton said Tehran's offer-submitted Monday to the U.N. nuclear watchdog-was inadequate and did not address international concerns about Iran's atomic ambitions....