Harris endorsed Joe Biden in March.

California Senator Kamala Harris (C) endorses Democratic presidential candidate former Vice President Joe Biden as she speaks to supporters, alongside Michigan Governor Gretchen Whitmer (L) and New Jersey Senator Cory Booker (R) during a campaign rally at Renaissance High School in Detroit, Michigan on March 9, 2020. (Photo by JEFF KOWALSKY / AFP) (Photo by JEFF KOWALSKY/AFP via Getty Images)