Directional Bias For The Day: S&P Futures are little changed; drifting down since 4:30 AM after rising since 1:00 Pm on Monday Odds are for a down to sideways day – watch for break above 2796.50 for change of fortune Key economic data due: ISM Non-Manufacturing PMI (est. 57.4; prev. 56.7) at 10:00 AM New…