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Alex directs me to this Fortune interview where McCain unsheathes a SuperSoaker of crazy:

Senator, what do you see as the gravest long-term threat to the U.S. economy?" That was the first question we put to John McCain when he sat down for an interview with Fortune on a sunny afternoon in June. The moment felt charged....McCain at first says nothing. He sits in the corner of a sofa, one black, tasseled loafer propped against a coffee table. We're in the presidential suite on the 41st floor of the New York Hilton. McCain has come here - between a major speech on the economy in Washington, D.C., this morning and a fundraiser tonight at the 21 Club - to talk to us and to let us take his picture. He is wearing a dark suit, as he almost always does, with a blue shirt and a wine-colored tie. He's looking not at us but into the void. His eyes are narrowed. Nine seconds of silence, ten seconds, 11. Finally he says, "Well, I would think that the absolute gravest threat is the struggle that we're in against radical Islamic extremism, which can affect, if they prevail, our very existence. Another successful attack on the United States of America could have devastating consequences.""If they prevail."There are essentially two sets of premises under which you could answer this question. The first is the real world, which contains likely threats to the American economy. Things like a deep recession that's worsened by a credit contraction. Or oil prices that turn out to be skyrocketing not because of transient speculation, but enduring global instability and a dawning recognition of peak oil. Or a health system that isn't fixed, and is chewing up 30 percent of our GDP in two decades.The other set of premises is the fantasy world. This is more like Marvel's "What If?" series. What is the Supervolcano explodes? What if we have an "I Am Legend" style pandemic? Or a "28 Days Later" zombie virus? What if "radical Islamic extremism" prevails and terrorists establish a global caliphate?