Agency MBS fail to bounce from the "massive liquidation" following Bernanke's testimony yesterday, according to CIBC's Tom Tucci. Suggestions of a tapering of Fed purchases sent Fannie Mae MBS with 3% coupons to their lowest levels of the year. "Right now it seems the only source of demand is the Fed," says BAML's Brad Scott. Unsurprisingly, pure agency mREITs like AGNC and ARR hit 52-week lows today. Annaly (NLY) - now diversified into the commercial space with the CXS purchase - outperforms.