Now that the Office of Federal Housing Enterprise Oversight has issued its hard-hitting report on the accounting abuses at Fannie Mae, some GSE watchers with a sense of history suspect the days of being gainfully employed at Fannie are numbered for current President and CEO Daniel Mudd. One need only look at GSE rival Freddie Mac for a recent historical parallel. An accounting scandal erupts, top executives are let go, a senior official is promoted,…