As Congress returns from its August recess next week for an abbreviated legislative session, mortgage market watchers inside the Capitol Hill beltway forecast a significant shift in the focus of those seeking to oust the current head of the Federal Housing Finance Agency. When Congress adjourned for the summer six weeks ago, lawmakers were alternately fuming or lauding the long-awaited decision by FHFA Acting Director Edward DeMarco to not allow Fannie Mae and Freddie Mac to implement the Treasury Department’s Home Affordable Modification Principal Reduction Alternative.