Corn futures are showing gains of 1 to 3 ¾ cents so far on Friday. March options expire today. Spillover support from double digit gains in wheat is helping. The CmdtyView national average Cash Corn price is up 1 3/4 cent to $3.94 1/4. With just a little over a week left in the Crop Insurance price discovery, the average December corn close has been$4.60, down a dime from the same period last year. Export Sales data continues to show strong export sales, with old crop corn sales at 1.47 MMT in the week ...