GSE critics in Congress might be able to forego controversial statutory caps on Fannie Mae’s and Freddie Mac’s mortgage portfolios after they study the way pending capital requirements have influenced Fannie’s current performance and business strategy. According to recent company data, Fannie’s portfolio shrank at an annualized rate of 19.1 percent in February, after dropping at a 16.8 percent pace the month before. The move is apparently part of the GSE’s overall strategy to reduce its…