"You know the definition of a Southern moderate? That's a cat that'll lynch you from a low tree." That joke, delivered in the 1960s by trailblazing comedian and civil rights activist Dick Gregory, who passed away Saturday, seems unsettlingly relevant in today's America. Though we aren't in the midst of the struggle for civil rights, that joke was about the evils of white supremacy -- something we are clearly still grappling with today.