U.S. House Majority Leader Nancy Pelosi’s surprise visit to Taiwan kept the CBOT on the defensive Tuesday amid a lack of other fundamental news. China has not received the Speaker’s visit well at all and even issued a thinly veiled threat that it might shoot down her plane. That didn’t happen, fortunately, but China did respond with a military show of force. The concern for the grain markets, of course, is that a political battle – whether or not involving military assets – between the U.S. and China will likely involve the grain trade. Then there’s the broader issue that markets simply don’t like uncertainties and traders typically adopt a “sell first, ask questions later” attitude in m...