with lester holt. in cairo, and other major cities, the protesters show no sign of backing down. there is a large military presence on the streets but so far the army appears to be leaving people alone. the police have now retreated. but clashes with preteotesters e left 70 dead and more than 1,000 injured. president of egypt, mubarak has elected a new vice president today. richard engel joinsous tonight from cairo. good evening. reporter: good evening kate. if president mubarak thought that making some minor concessions, changes his government, naming a vice president, if he thought this would stop the protests, then he badly miscalculated. the eegyptian government now seems teetering on collapse. today tens of thousands of protesters converges on the main square. the police were no longer on the streets today. so unopposed, the demonstrators had the run of cairo. in the square, it was mostly pie peaceful. the crowds were claiming victory after yesterday s fierce battles