| Obama, his wife, daughters, and mother-in-law took part in 
				the annual tradition, which featured music by singers Mariah 
				Carey, Aretha Franklin, and the group Train.
 				"You are lucky I'm not singing," Obama joked to the rain-soaked 
				crowd.
 				The president used the occasion to pay tribute again to Nelson 
				Mandela, the former South African president who died on 
				Thursday.
 				"This year, we give a special measure of gratitude for Nelson 
				Mandela, a man who championed ... generosity of spirit," Obama 
				said to applause. "In his life, he blessed us with tremendous 
				grace and unbelievable courage. And we are all privileged to 
				live in a world touched by his goodness."
 				At the beginning of the ceremony, Obama initiated a countdown 
				that concluded with the lighting of the large tree — but he 
				started from five rather than 10 to speed up the proceedings in 
				the cold.
 				(Reporting by Jeff Mason; editing by Mohammad Zargham)
 
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