Hundreds of people stoned cars and rival ethnic groups fought in a sprawling slum Saturday amid tensions over delayed results from the closest presidential election in Kenya's history, witnesses said. A millionaire opposition leader who cast himself as a champion of the poor appears poised to win the race, but only partial and unofficial tallies have been released from Thursday's vote. In the Kibera slum, the main constituency of opposition candidate Raila Odinga, young men with machetes were running through the maze of potholed tracks and ramshackle dwellings. People set up makeshift roadblocks. About 30 kilometers outside Nairobi, hundreds of people were massed along a main highway.