A close Colombian run-off could prompt fraud claims

Significance

With leftist voters firmly behind Petro, more conservative undecided voters may give Hernandez a slight advantage. Colombians abroad are already casting their ballots, meaning that no new survey results will now be published.

Impacts

• Six of nine Constitutional Court judges will be elected during the next four years, but the president will only nominate two.
• With the run-off held during a long weekend, turnout is likely to be lower than in the first round, potentially affecting the result.
• Close polling results will be used as fodder for conspiracy claims and complaints concerning election integrity.