Stocks finish just above today's lows, more than erasing Wednesday's gains, as S&P bids farewell to 700, Nasdaq edges below 1,300, and all three averages drop at least 4%. DJIA -4.09% (-281.16) to 6,594.68. S&P -4.23% (-30.15) at 682.72. Nasdaq -4% (-54.15) to 1,299.59.