Markets are weak on a couple of concerns today.

1) Lower earnings estimates. The downward earnings revision from Citi , Washington Mutual and Merrill Lynch last week are really having an impact on Q3 earnings revisions. Seven or eight days ago, we were expecting 3.9% earnings growth for the whole S&P 500; today it is down to 0.7%, the lowest growth in five years, and it may still go negative.