A nuclear Iran would not be a good thing, but the nightmare scenario outlined by Shalev is highly unlikely. Has its nukes made Israel all-powerful and fearless? Containment and deterrence will work against Iran just as it worked in the case of the Soviet Union, which was far stronger. A military attack on Iran would be a disaster for the U.S. and if Obama opts for one before the election, it would ensure his defeat.
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from the article: Will a U.S. attack on Iran become Obama’s ‘October Surprise’?