So uth Africa's last apartheid-era president, F.W. de Klerk, right, looks over asPresident Barrack Obama waves to mourners after speaking at the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham)
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President Obama was among those who paid tribute to Nelson Mandela at a memorial service today in Johannesburg.