Oprah Winfrey makes surprise appearance at Democratic convention  BBC.com‘Let us choose joy!’: Oprah brings DNC to their feet  CNN’Let Us Choose Joy!’ Oprah Winfrey Urges US Voters  Barron’sOprah Winfrey, in a Convention Debut, Calls Harris ‘the Best of America’  The New York TimesIn a surprise appearance, Oprah rallies the Democratic convention  NBC News