Polls suggest Mexico’s ruling party will win Supreme Court.

• Morena party leads in Mexico’s first judicial election.

• Preliminary vote tallies show majority of 2,600 judge positions won.

• Nine Supreme Court positions secured.

• New justices share strong ties and ideological alignments with ruling party.

• The party overhauled the judicial system to elect judges.

• The governing party is close to controlling all three branches of government.