Before South Carolina, the Sanders team went all out in its effort to win black voters. The campaign filled the airwaves with black surrogates and invested in its ground game in the southern state. It looked to capitalize off its national momentum from previous strong performances and keep issues that are important to African Americans in the conversation in national debates. But ultimately Biden’s support — rooted in part in the lawmaker’s second-in-command position to America’s first black president — could not be overcome.