If Netanyahu calls for an early election in Israel, as seems very likely, it would probably take place in February or March of next year – just weeks after the inauguration of the next President of the US.
Given that Netanyahu would be taking a punt about being able to win the next Israeli election, one can assume that he would at least like to achieve his goal of creating a Greater Israel by destroying Hezbollah and Hamas and Israel’s arch nemesis, Iran, before leaving office. This would mean pushing for support for an attack against Iran from the US just as soon as the US elections are over. Netanyahu would not risk assuming he was going to win the next Israeli election before demanding the US support an attack against Iran. He knows that it will be an all or nothing war for him and he is hardly going to risk everything on winning an election before going for his dream prize.
Netanyahu’s window of opportunity opens on 7 November 2012 and closes just days before the next Israeli election next February or March 2013. If Romney wins the US presidential elections then Netanyahu can be assured of Romney’s support. If Obama wins then, being a second term President with nothing to lose and his military already in place in the Gulf, Netanyahu might just get the support he needs.