Is Rush Limbaugh underexposed? For the radio host's most ardent opponents, it's a silly question: Rush's bombastic views get far too much traction in the media as it stands.

Limbaugh biographer Zev Chafets, however, disagrees. On MSNBC, he tells Chuck Todd and Savannah Guthrie that the mainstream media "doesn't pay attention to Limbaugh." And because of that, "they don't really understand how much influence he has."

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