Ben Carson on "volatile" past, trying to stab a friend

Republican presidential candidate Ben Carson, in defending against criticisms of his relaxed demeanor on the campaign trail, opened up about his past "volatile" behavior during an interview that aired Sunday. "I have plenty of energy. But, you know, I am soft-spoken. I do have a tendency to be relaxed. I wasn't always like that. There was a time when I was, you know, very volatile," Carson told NBC News. "But, you know, I changed."


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