Stock futures struggled in mixed territory ahead of Wednesday's open as a barrage of earnings reports powered some steep, premarket reactions. Dow futures traded down 11 points, but held just above fair market value. S&P 500 futures were down 2.5 points, while Nasdaq 100 futures clung to a one point gain. McDonald's (MCD), General Dynamics (GD), Abbot Laboratories (ABT) and Baker Hughes (BHI) were among the blue chip companies trading in a narrow