Herman Cain is Mitt Romney's worst nightmare, but not for the reasons you might think.
Sure, the former pizza company CEO shares top-tier status with Romney in most national polls of GOP voters, and his fortunes are on the rise in early voting states. But nobody outside his small circle of advisers believes that Cain has a significant chance of winning the nomination.
The most serious threat Cain poses to Romney is that his candidacy, however fragile and fleeting, underscores the power of a virtue that Romney seems to lack: Authenticity.
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