Stocks continued to hold near their sessions lows late Thursday. Mixed economic data and continued worries over the Fed taking away the punchbowl put equities on defense for a second straight session. The Nasdaq slumped 1.2% and neared its 50-day moving average. The S&P 500 fell 0.8% and was hovering near the psychological 1500 level. Meanwhile, the Dow Jones industrial average fell a milder 0.5%, thanks to a jump in Wal-Mart (WMT). Volume was