Harris: Biden would make a "great" vice presidential running mate

Harris has kept her options open, adding that: "There are certainly a lot of other candidates that would make, for me, would make a very viable and interesting vice president."

The big picture: Members of the Congressional Black Caucus said Biden as the presidential nominee and Harris as his VP would be the "dream ticket," per Politico. A Trump adviser previously told Axios that if Harris draws strong support from African-American voters, that could present a challenge in 2020. Several male, Democratic candidates have been asked whether they would commit to a female running mate.

Go deeper: Kamala Harris on the issues, in under 500 words