Whether George Bush is relected president in November or not he's going to have a very difficult decision on his hands, a decision which evidently must be made before the New Year. Iran will, in a few months by some estimates, begin construction of nuclear weapons. Once they start they must be assumed to be prepared to use them as soon as they can because every day they delay they risk losing them to an Israeli or American attack (It is just fantasy to think that perhaps Europe would have the will to do something to prevent a nuclear-armed Islamist state).
Iran has fifteen sites working on the production of fissile uranium. Those sites are presumably hardened to withstand a bomb drop. Do we try nonetheless to destroy them with conventional ordinance? Do we insert troops? Do we have the manpower available to take out these sites if bombing doesn't work? How will the Iranians respond if we attack? What will they do if we let them produce nuclear weapons? Can we afford to wait and find out? Belmont Club has an interesting discussion of some of the relevant questions.