 NBC News Radio. I'm Michael Kastner. President Biden is dropping out of the 2024 presidential race and throwing his support to his vice president, Kamala Harris. This comes after Democratic leaders for weeks have expressed concerns about the 81-year-old's mental fitness and his path to victory over Donald Trump. The Democratic delegations from at least five states have endorsed Vice President Harris for president. Tennessee Democratic State Party Chair Hendrell Remus said the delegate's support was unanimous.