Directional Bias For The Day: S&P Futures are lower Drifting down  since 3:30 PM on September 20; below a downtrend line from the high of 2507.00 at 9:30 AM on Wednesday Odds are for a down to sideways day – watch for break above 2506.75 Key economic data due: Unemployment Claims (est. 302K) at 8:30 AM Philly Fed Manufacturing Index (est. 17.3) at…