Realtors in California are laying the groundwork for an increase in the conforming loan limit - a move that could benefit Fannie Mae and Freddie Mac. But the government-sponsored enterprises say that reports which have linked them to a lobbying campaign on the issue are inaccurate. "It’s vapor," said Janice Daue, Fannie Mae’s vice president for corporate affairs. "We have not taken a position on loan limits." Similarly, a Freddie Mac spokesman said last week