美聯儲 press release Nov. 25, 2008 沒有像你說的那樣,將mortgage 排除在外,相反地,在 TALF Terms and conditions (PDF) 寫道:"The set of permissible underlying credit exposures of eligible ABS may be expanded later to include commericial mortgage-backed sercuirties, non-Agency residential mortgage-backed securities, or other asset classes."
接下來,美聯儲 press release Dec. 30, 2008 明確宣布要購買"兩房"的 mortgage-backed securities (MBS)。至此,已經毫無疑問,美聯儲擔保(按你更嚴格的說法是"保險")了"兩房"的債卷。