Sen. Richard Shelby, R-AL, trying to maximize the political potential of Fannie Mae’s recent blockbuster settlement, is setting the stage to move long-stalled GSE reform legislation by the end of summer, perhaps as early as July. Speaking to reporters immediately after a confirmation hearing on the nomination of James Lockhart as permanent director of the Office of Federal Housing Enterprise Oversight, Shelby said he and his colleagues are “seriously working on the GSE bill” and…