The mother of Mexican President Vicente Fox died on Thursday, three days before national elections to choose her son's successor. Mercedes Quesada, 86, died at the family ranch in the central state of Guanajuato, the president's office said. Private services were scheduled for Friday, the office said. It provided no other information. Born in Spain and the mother of nine children, Quesada had suffered from health problems since suffering a brain hemorrhage in 2000. Fox was at the ranch in Guanajuato on Thursday night, local online press reports said. Mexicans will go to the polls on Sunday to elect a...