Stocks were off their session highs and mixed in early-afternoon action Tuesday. The S&P 500 and Dow Jones industrial average both added 0.2%, while the Nasdaq dipped 0.2%. Volume was tracking higher from Monday's levels. Dick's Sporting Goods (DKS) rose 5% in strong volume and regained its 50-day moving average, helped by its strong third-quarter earnings report. The sporting goods retailer said Q3 EPS rose 25% to 65 cents, beating forecasts, as