Fannie Mae ended 2012 with its single best quarterly and yearly profit in company history, prompting the government-sponsored enterprise to predict sustained profits “for the foreseeable future,” without taking into income any of the massive allowance it has built up related to deferred taxes. Fannie reported net income this week of $17.2 billion for 2012, compared to a net loss of $16.9 billion in 2011, with fourth quarter earnings of $7.6 billion. A year earlier, the GSE posted a $2.4 billion loss for the fourth quarter of 2011. “We had...