Why is Israel trying to use powerful Jewish communities in the US to stop the UN vote on Palestinian state?

a href="http://www.haaretz.com/news/diplomacy-defense/israel-s-un-ambassador-tells-u-s-jews-prepare-for-september-vote-on-palestinian-state-1.368773" rel="nofollow"http://www.haaretz.com/news/diplomacy-de…/a