Corn futures ended about 3 cents lower today under pressure from last week's relatively small export sales, further evidence that lower Brazilian offers as far ahead as November are cutting into demand for U.S. corn. General Comments It was not a good day for quite a number of markets. Stocks finished lower with the Dow off 120 points. Crude oil fell to $44.66, down $0.49 and 27 percent lower since its spring rally peaked in June. Copper finished lower. The U.S. Dollar Index dropped below 98.0. Corn and soybeans declined, but wheat countered the trend to close higher. All of the prominent commodity indices finished lower.The weekly export sales report through 30 July played a big role in today's price action. Last week's wheat sales reach...