Absent some last-minute fireworks, President Bush will leave office with a kind of double failure on Iran: Administration hard-liners haven’t checked Tehran’s drive to acquire nuclear-weapons technology, and moderates haven’t engaged Iran in negotiation and dialogue.

The strategic balance between the two countries is the opposite of what Bush had hoped to accomplish: Iran is stronger than it was eight years ago, and the United States, fighting costly wars in Iraq and Afghanistan, is weaker. Iran spurns America’s carrots and dismisses its sticks…

It’s easy to criticize the Bush record on Iran. But anyone who thinks it will be easy for Obama to make a breakthrough hasn’t been paying attention. Iran moves closer every day to becoming a nuclear-weapons power. It views America as an aggressive adversary that wants regime change, no matter what Washington says. Dialogue is worth a try, but Obama and his advisers should start thinking about what they will do if negotiations fail.