As I’ve been reading on this, I realize it isn’t about the US election with Netanyahu. It’s about a belief that Iran has passed some red flag marks that the US believes they’ve not crossed.
For example, hypothetically, perhaps Netanyahu has Mossad info that says Iran has successfully tested triggering devices, and the US says they haven’t. My reading says Israel’s concern is entirely about the stage of Iran’s program and the specific point in that process at which Israel can no longer successfully DELAY it by means of a military strike. Israel believes that day is extremely close AND prior to the US election.
I think they have to wait until after the election. One of the problems they've been having is information about what they have been doing keeps getting leaked to the media. Also, any attack would reguire notifying the USA because we have so many ships in the area that would pick up their planes, or missles, and Israel does not want us shooting them down. So Israel is in a real tough spot. They can't act now because the obama admn. will leak it and if they wait it may be too late.
FWIW, I think they attack in Feb. 2013 after R&R are inaugurated.