MADRID: They are two angry political warriors bearing grudges from the past, each convinced the other is a liar and an incompetent destined to destroy the country. Spanish voters went to the polls in a general election Sunday, a rematch of the bitter contest four years ago between Prime Minister José Luis Rodríguez Zapatero on the left and Mariano Rajoy on the right. In 2004, Zapatero unexpectedly swept to victory, ousting Rajoy's Popular Party from power as enraged voters protested the government's mishandling of terrorist bombings that killed 191 people in Madrid three days before the election. The candidates have...