In the small town of Maravatío in central Mexico, two candidates for the office of mayor were killed in one day. On Tuesday, Mexico’s conservative opposition National Action Party (PAN) demanded the authorities conduct a thorough investigation into the murders and bring the perpetrators to justice. PAN’s Armando Pérez and left-wing Morena party’s candidate Miguel Ángel Zavala were both shot dead in their cars on Monday according to the Attorney General’s Office in the western state of Michoacán. The background was initially unclear. According to media reports, around a dozen candidates and pol…