Watch live: Oprah Winfrey speaks in surprise DNC appearance

Billionaire philanthropist Oprah Winfrey is set to take the stage at the Democratic National Committee in Chicago, for a surprise speech in support of Vice President Kamala Harris' 2024 campaign.

Winfrey has a history of political involvement with Presidents Barack Obama and Joe Biden. She is expected to speak enthusiastically in favor of the Harris-Walz ticket.

Winfrey's appearance was announced last-minute. She joins a jam-packed lineup Wednesday that also includes speeches from former President Bill Clinton and the vice presidential running mate himself, Minnesota Gov. Tim Walz.

Watch the speech below or at the link here.