Mortgage industry groups cannot seem to agree on whether there should be more than two guarantors of conventional mortgage-backed securities once Congress and the White House figure out what to do with Fannie Mae and Freddie Mac. The Mortgage Bankers Association firmly supports multiple guarantors, arguing that more competition is better. But groups representing smaller lenders worry about the burden of maintaining relationships with many secondary-market outlets and the potential for an uneven playing field. David Stevens, president and CEO of the MBA, said...