Et tu, Fannie and Freddie?
Analysts worry that the mortgage giants won't be able to raise enough money from investors to cover rising losses from loan defaults. Those doubts have ramped up a sell-off by investors, sending shares of both companies to 17-year lows.
Both companies are vital to the housing market, and the government is considered likely to step in to avert any potential failure through loans or guarantees of their debt. But the steep plunges in their stocks - Freddie Mac has fallen 50 percent in just the past week - underscores the potential for the housing downturn to extend well into next year.