I really don't believe Obama is an "enemy of Israel". He's an remarkable candidate who promises much hope with his eloquent words. I do believe that Israeli's and the Jewish community are very paranoid at this time, and worried- trying to figure out the real politics of the candidates.
Here is something from the editor of The Jerusalem Post called "Editor's Notes: The challenge of the would-be presidents"
http://www.jpost.com/servlet/Satellite?cid=1205420743245&pagename=JPost%2FJPArticle%2FShowFull
It may give some insight into some of the thinking that's taking place in this regard.