The Morena party controls most of Mexico’s government. Its sway over the Supreme Court is set to increase after a judicial election that raised fears about democracy.

Mexico is holding its first ever judicial elections, which have sowed confusion among voters as they struggle to understand a process set to transform the country’s court system.

Andrés Manuel López Beltrán, operations chief of the ruling Morena party that his father founded, oversaw the political machine that mobilized millions of working-class voters to participate in Sunday’s election.