Sen. Elizabeth Warren’s support among black voters is down to 4% in a new poll, a result that will be deadly to her presidential ambitions if she can’t turn things around.

The big news in the new Quinnipiac poll is that Sen. Kamala Harris, at 20%, has surged into a statistical tie with Joe Biden, who is at 22%. Before Harris mauled Biden in the first Democratic presidential debate, Biden was at 30%, and Harris was at just 7%.