Running a very distant third, in single digits, was Antanas Mockus of the Partido Verde.
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Antanas Mockus, a maverick independent professor of philosophy, won election as mayor of Bogota, a job he did well in the mid-1990s.
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With almost all the votes counted, Mr Santos had won 69% of the ballots and was more than 40 points ahead of his rival - Green Party candidate Antanas Mockus.
BBC: Government candidate Santos wins Colombia election