For the reasons outlined here. I don't think true peace is achievable at this point between Israel and Palestine, but if it is you need somebody committed to peace in order to achieve it. I do think that formal peace with Syria, for example, is achievable. Livni believes in peace. Benjamin Netanyahu does not. If he is elected, he will scuttle the peace talks in short order and reinvade Gaza. He will act like the hawkish tool that he is and let Islamists provoke him, just as they successfully did with Olmert in 2006. In short, any possibility of peace goes out the window if Bibi returns to the premiership.
In general, though, I don't understand Americans who take partisan sides in other countries' politics. In Britain, for example, I don't really take sides between Labour and the Conservatives. (This, of course, presupposes that there is an appreciable difference between the two these days.) Gordon Brown would be an Atlanticist who would continue the special relationship. Same with David Cameron. If anything, I'm pulling for Cameron as I hope that US conservatives use him as a model for reforming their movement.
