The U.S. Attorney's Office has filed a secret lawsuit against Rep. Randy "Duke" Cunningham that contends he should forfeit his Rancho Santa Fe home to the government because it was purchased with illegally obtained money. Notice of the lawsuit and the government's interest in the property was filed with the San Diego County Recorder's Office. Cunningham's attorney, Lee Blalack, declined to comment yesterday on the lawsuit but said he had filed a motion challenging the U.S. government's legal claim on the house. The home – a five-bedroom, eight-bath Spanish colonial estate on Via Del Charro – was listed for sale...