Several key Senate democrats this week urged Fannie Mae and Freddie Mac to continue expanding their presence in the subprime mortgage market. Not surprisingly, industry officials are dismissing the remarks as a product of heavy lobbying. "Fannie Mae and Freddie Mac help prevent predatory lending," said Sen. Debbie Stabenow, D-MI, during a hearing on the government-sponsored enterprises in the Senate Banking Subcommittee on Housing and Transportation. "Failure to get involved in these markets could almost