Former Vice President Kamala Harris said she's "thinking about" a 2028 presidential bid, but some previous supporters are unenthusiastic -- despite her national name recognition and experience as second in command.

ABC News spoke with more than 15 former donors, fundraisers, campaign aides, Biden White House staffers and current advisers about Harris running again, some of whom asked not to be named to be able to speak freely.

A source familiar with Harris' thinking told ABC News that she's considering all options, but hasn't begun explicitly deliberating on a run with her team.