MEXICO CITY—Mexicans began voting Sunday in a presidential election expected to make former Mexico City Mayor Andrés Manuel López Obrador the country’s first leftist president since the 1980s.
Pre-election surveys gave Mr. López Obrador, who made the fight against corruption the theme of his campaign, more than a 20-percentage-point lead over the other two main candidates, conservative Ricardo Anaya and José Antonio Meade of the ruling Institutional Revolutionary Party.
...