The editor of the website Wikileaks has overseen the publication of several leaks of classified information from several governments.
Assange is wanted in connection with criminal investigations in the US and Sweden. To avoid extradition, he was granted political asylum by Equador and since 2012, he has been living in the country's London embassy.
Ruling party candidate Lenin Moreno headed the presidential poll but perhaps lacked the votes to win outright in the first round, according to preliminary results. Wikileaks founder Julian Assange is watching closely.