I just spent a few months in the US as part of a semester's sabbatical. One of the things I saw up close was that people no longer take Israel's right to exist as a given. This is partly due to ignorance, part to the emotions aroused by the preent war, and part by genuine rejection of the right of the Jewish people to self-determination in the Land of Israel. Sadly, even people who do support Israel, don't know how to make a case for it. So, if you're in this situation, here's a solid piece of work from the Jerusalem Center for Public Affairs, entitled An Answer to the New Anti-Zionists.