At the end of July, Fannie Mae and Freddie Mac will report second quarter results that might be marred – at least a little bit – by non-cash hedging charges caused by lower interest rates. When June ended, the benchmark 10-year Treasury bond carried a yield of 2.30 percent, 10 basis points lower than at March 31. Lower rates usually translate into hedging markdowns, but since the decline was so small it’s unlikely that either government-sponsored enterprise will record a net accounting loss for the period. In general, the two don’t discuss...