Fannie Mae made headlines during the holiday season with the forced departure of its two top executives. But these major resignations may prove to be just the tip of the iceberg as the fallout from Fannie’s accounting scandal continues to unfold. Last year ended with the momentous – although not unexpected – announcement that Fannie’s well-respected Chairman and CEO Franklin Raines and CFO Timothy Howard were stepping down from their positions at the company. Raines…