Despite the newly signed debt ceiling deal passed in the nick of time this week by Congress and signed by President Obama, Fannie Mae, Freddie Mac and the Federal Home Loan Banks remain at risk of having their AAA ratings downgraded if the government fails in the future to keep its fiscal house in order, according to Moody’s Investors Service.Moody’s confirmed the AAA government bond rating of the U.S. following the raising of the statutory debt limit on Aug. 2, but the credit rating agency assigned a “negative” rating outlook to Uncle Sam.