The corn and wheat futures markets have clearly abandoned their trading ranges of last fall and are trying to find new ones at some lower level.There are always outside influential factors, and they seem especially numerous this year.Typically, late January is a quiet time for agricultural futures markets. USDA's January reports have been digested. Although the bulk of the South American harvest is not yet underway, markets have already absorbed perceptions about their potential. The Northern Hemisphere's winter wheat crop is still dormant. Also each year at this point, the chances for some surprising change in the outlook for demand during the balance of the crop cycle are pretty low. Still to come are the prospective spring plantings. One...