Oprah Winfrey, in a Convention Debut, Calls Harris 'the Best of America'The surprise appearance by the television legend was closely held by Democratic organizers. Ms. Winfrey even rehearsed her speech wearing sunglasses and a face mask.
Source: Oprah Winfrey, in a Convention Debut, Calls Harris 'the Best of America' (https://www.nytimes.com/2024/08/21/us/politics/oprah-winfrey-kamala-harris-dnc.html)