Daniel Ortega, the former leader of the Left-wing Sandinistas in Nicaragua and one of the United States' most reviled Cold War enemies, appears to be on the brink of making a spectacular comeback.Twenty years after his Sandinista government fought a bitter civil war against American-funded ''Contra" rebels, he is leading in the polls for the presidential elections on Sunday. But now he has ''found God" and talks of ''peace and love" not Marxist-Leninist ideals. In a final frenzy of campaigning, the podgy, balding 60-year-old, is spreading what he calls a "spiritual revolution", "full of love and hope" around this country,...