In an urban church near looted downtown buildings in Kenosha, Wis., Joe Biden told the diverse group in the pews that President Donald Trump was the accelerant for the country's burning racial divide. An hour later, in a leafy Milwaukee suburb that is 90 percent White, Biden discussed the challenges of going back to school when districts are struggling to reopen - a problem they wouldn't have, he said, if Trump hadn't bungled the coronavirus response.