pictures of his motorcade, tweeting out the pictures of the president stuck in traffic, heading into johannesburg. senior officials told us about this speech, nelson mandela means a lot to this president. the president had not really been working on his remark for what he's going to be saying today until after it was confirmed that nelson mandela had passed away. he's been working on this over the weekend and on air force one. doing that, while he had secretary of state hillary clinton and former president george w. bush and former first lady barbara bush on air force one with him. >> former president clinton was just seen. you heard the crowd react. it's a special thing about this occasion at nelson mandela's memorial, that you have regular people mixing in one place with some of the most important people in the world, christiane amanpour.