Indie candidates also stormed to victory in key races in Jalisco, while the upstart leftist Morena movement made gains in Mexico City and in Congress. One man is killed in Guerrero.
Protesters burned ballots and attacked polling places in Guerrero, Oaxaca, and Chiapas. Exit polls were suggesting tight races in key state governor races, including Nuevo Leon, where indie candidate "El Bronco" was pulling ahead.
Federal officers attempted to prevent the Ayotzinapa students from setting up for a solidarity concert on Sunday, sparking clashes that left 22 people injured, including two parents of the missing.