More than 2,100 COVID-19 deaths were reported in the U.S. on Tuesday, making it the deadliest day the country has seen in six months. The virus continues to hit hard in America's heartland. "CBS This Morning" lead national correspondent David Begnaud reports from Fargo, North Dakota, and Dr. Leo Nissola, an immunotherapy researcher, joined CBSN to discuss the latest on a vaccine.
