A recession resulting from the federal government taking the U.S. economy over the fiscal cliff would leave Fannie Mae and Freddie Mac vulnerable to higher credit losses and make the two government-sponsored enterprises unprofitable again, according to Moody’s Investors Service. Moody’s this week warned that Washington’s failure to reach a tax and spending agreement would also force the GSEs to ride out the shockwaves of potential financial market disruptions on their derivatives trades. “In our current central economic scenario, both Fannie Mae and Freddie Mac are...