Franklin D. Raines, the former chief executive of Fannie Mae, used a special program at mortgage lender Countrywide Financial to receive a below-market rate on a home loan, contrary to sworn testimony he made to Congress in December, according to the top Republican on the House Committee on Oversight and Government. Rep. Darrell Issa (Calif.) released documents yesterday that he said show Raines received discounts and waivers of fees on a June 2003 home loan through the "Friends of Angelo" program, named after Countrywide's then-chief executive, Angelo R. Mozilo.