joe saluzzi with is with us. it was far from a flash crash, but stocks fell in a broad-based sell-off, with commodities getting hammered, the dollar strengthening, and bonds rallying. let's get to tonight's "market focus." all ten of the major s&p stock sectors were weaker, as the index ended lower for the fourth straight session. it's the first time the index has been down four days in a row since the height of the financial collapse in the fall of 2008. thanks to the sell-off in oil, energy stocks led the market losers. the energy exchange traded fund shed 2%. volume was big, coming in at almost three times its average pace. with the selling, the index has broken below its low from last month and is threatening the march low. the two big oil stocks in the dow fell hard. exxon dropped 2.6%; chevron was off 2%. trading volume was heavy for both of them. since reporting earnings last week, both of these stocks are down about 6%. as we mentioned, the commodity weakness was not confined to energy. metal prices fell,