U.S. President Barack Obama pays his respect to Mandela`s widow Graca Machel after his speech at the memorial service for late South African President Nelson Mandela at the FNB soccer stadium in Johannesburg on Dec. 10. Reuters-Yonhap News
The crowds booed South African President Jacob Zuma, who was to give the keynote address at the service, which started an hour late. Many South Africans are unhappy with Zuma because of state corruption scandals, though his ruling African National Congress, once led by Mandela, remains the front-runner ahead of elections next year.