The first black president found that he was personally toxic to the GOP base. An entire political party was organized around the explicit aim of negating Obama. It was thought by Obama and others that this toxicity was the result of a relentless assault waged by Fox News and right-wing talk radio. Trump's genius was understanding that it was something more, that it was a hunger for revanche so strong that a political novice and accused rapist could topple the leadership of one major party and throttle the presumed favorite of another.