At first glance this poll is quite troubling, but Daniel Larison says that:

I would hasten to point out that this is actually a slightly lower percentage than we have had in the past. Crazy anti-Iranian jingoism is somewhat less persuasive than it used to be almost two years ago, and that seems like marginally good news to me. (57% back in 2006--Financial Times)

Could it be that the Bush/Cheney/Kristol/Lieberman "I want to destroy the world" brigade are faltering a bit? I really hope so. (h/t Cole)