Joe Biden's theory of the case is that his current support among black voters will lead to success in Nevada and South Carolina. That, in turn, he hopes will propel him to victory in the Super Tuesday contests in early March.Michael Bloomberg, along with other candidates, hope to earn the support of black voters and erode Biden's base. For Bloomberg, his past remarks about black men and crime, "stop-and-frisk" policing, and housing discrimination could make that difficult.This episode: congressional correspondent Susan Davis, demographics and culture correspondent Juana Summers, and national political correspondent Don Gonyea.Connect:Subscribe to the NPR Politics Podcast here.Email the show at nprpolitics@npr.org.Join the NPR Politics Podcast Facebook Group.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station.