Diplomatic efforts to prevent Iran from building an atomic bomb may fail, U.S. officials and foreign diplomats say, leaving the winner of today’s presidential election with the threat of an Islamic fundamentalist, nuclear-armed regime in Tehran.The debate over Iran will probably strain a White House that is already preoccupied with Iraq no matter who wins today’s presidential election. Bush administration hard-liners are gearing up for the issue in a potential second term, studying options that include striking a deal with the Iranians, pushing for regime change and launching preemptive attacks. Full Story