Fiery Democratic debate: Race, age, health care and Trump

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., center, gestures towards former vice president Joe Biden, as Sen. Kamala Harris, D-Calif., talks Thursday during the Democratic primary debate in Miami. (AP Photo/Wilfredo Lee)

MIAMI — Democratic divisions over race, age and ideology surged into public view in Thursday night’s presidential debate, a prime-time clash punctuated by a heated exchange between former Vice President Joe Biden and California Sen. Kamala Harris.