Both Fajardo and Duque are dynasty politicians from Antioquia. Voters in the capital Medellin will choose between two relatively popular politicians.
Former Bogota Mayor Clara Rojas said she endorsed Gustavo Petro. This former guerrilla and Bogota mayor is second in the race for the first election round in May next year.
The latest endorsements have strengthened the chances of Fajardo, whose allies can count on loyal support from the capital.
Colombia’s most important election candidates ahead of
Duque has only just received the unequivocal endorsement of former President Alvaro Uribe who has remained solid support among the country’s most conservative.
A number of staunchly conservative candidates are still running. They are expected to endorse Duque later on in the race.
Former VP German Vargas, a powerful member of a traditional Liberal Party dynasty, has independently tried to appeal to a more conservative voter base.
The two main talking points during the elections are an ongoing peace process with FARC guerrillas and widespread government corruption.