The prospects of overhauling oversight of Fannie Mae and Freddie Mac are growing fainter after key lawmakers have apparently rejected a revised version of the proposal introduced in the House, while scheduling conflicts may emerge in the Senate. Rep. Michael Oxley, R-OH, chairman of the House Financial Services Committee, has been scrambling to save a section of H.R. 1461 that would set aside 5 percent of Fannie’s and Freddie’s profits to help needy homebuyers. The…