Winfrey, who has endorsed Harris and spoke at the Democratic convention in August, is set to host a two-hour “Unite for America” nighttime streaming session in Michigan with Harris that organizers say aims to highlight dozens of grassroots groups backing the vice president.

U.S. Democratic presidential candidate Kamala Harris will join celebrity billionaire Oprah Winfrey for an online event with grassroots groups on Thursday to rally support in battleground states.