 Many Democrats conceding the president did not have a great performance. Biden campaign co-chair Senator Chris Coons telling Fox News. Last night was a rough start for Joe Biden, our president. Vice President Kamala Harris also admitting he had a slow start, but she added there was a strong finish. Some critics, though, wondering if the president could be replaced as the nominee at the Democratic National Convention. It's not easy to do. The rules would mandate that the president back away from the nomination before August 7th.