Happens all the time. Some staid, button-down white guy experiences an unaccountable, yet irresistible, urge to be hip and score some political correctness points by playing up a stereotype of his own race and sex - which, in this case, he invents out of whole cloth. Result? Dude makes a fool of himself.
What the hell does Tom Brokaw mean when he talks about Mitt Romney's "white man's overbite"? Is there something characteristic about a white man's overbite that differentiates it from that of a black man's or an Asian's? If so, this is a physical phenomenon that is strangely unremarked in the entire annals of dentistry. Is Brokaw just pandering to non-whites? Or is he jealous because his own teeth are perpetually hidden behind a tight-lipped smirk (does he, in fact, even have any teeth)?
C'mon, Tom, I wanna see you gum some crow.