Ben Carson's Achilles Heel

Ignorance and arrogance:

"When you watch Carson navigating the public square you see someone who is remarkably ignorant about huge swathes of human knowledge and particularly information about US government and public policy. But you also see someone who's quite confident he's very knowledgable. So he's both remarkably ignorant and either stunningly unaware of his ignorance or totally indifferent to it. You might even say he is militantly ignorant. In all aspects of life, that is a dangerous combination. And the combination is almost always rooted in arrogance."