If they do attack it will help re-elect “The Divine One.”
If the US is drawn into the conflict, prior to November 6, it could conceivably create a rally-round-the-flag effect, that would be helpful to the Obama re-election effort.
If that does not happen, however, I am not at all convinced that an Israeli attack upon Iran's known and suspected nuclear facilities would be likely to assist President Obama, in his quest for re-election...