You know Obama, and his foreign policy in the middle east, while a Republican will be an unknown. So, Israel has to consider who will be the next President of the USA as well as its own actions; and whether a known is better than an unknown. Obama, chose to act in Libya, not unilaterally, but multi-laterally, and he chose to lead from behind; the cost in Libya was a mere billion, which is as much spent in one day in Afghanistan??? Syria is a hot spot now; so what actions to take on Syria are important USA foreign policy. Obama is seeking support from Europe and other muslim countries in his middle eastern policy; he is no longer taking the unilateral policy of George Bush; and Bush's pre-emptive strikes was a bad policy because the other countries could take a pre-emptive strike against Israel or the USA, including China someday.
Palestinian reportedly shot dead by Israeli soldiers after approaching Gaza border fence (Haaretz)
from the article: An attack on Iran would be a disaster for Israel