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I used to laugh at people who would say "if so-and-so is elected, I'll have to make plans to leave the country." I may not leave, but I'm not laughing anymore.
McCain at one time might have been a fine president (I actually liked him in 2000, especially compared to FratBoy) but now the disconnected, disoriented, tired or maybe just too-plain-old thing is more than bothersome. It would be disastrous.
Think of how vulnerable we would be, again, to the Rovian-types and other assorted thieves that have preyed upon us for years through the manipulation of a frontman who is too stupid, old, or evil himself to even try to stop it. Or even to be aware of it.
These are not idle concerns. This is end-of-empire stuff.