>> reporter: ultimately, for tennessee voters in today's polarized political climate, how they vote may hinge on what matters more, a chance for moderation or party loyalty. martin savidge, cnn, knoxville, tennessee. >> as tuesday's midterm election approaches quickly now, trump's closing argument to his rural white base has increasingly been about identity politics. from rallies in west virginia to indiana to missouri to montana, trump has played up race with a simple warning. bad hispanic people are heading their way and must be stopped. i want to discuss this with the author of "heartland: a daughter of the working class reconciles a divide." sarah, you dig deep into the demographic that helped put trump into the white house. what is it about his closing