The Mexican presidential candidate vowing to fight for the poor

In less than a week, Mexicans will go to the polls amid a turbulent period defined by drug violence, corruption and a stagnant economy. Those conditions have given rise to veteran leftist politician Andres Manuel Lopez Obrador, who is riding a wave of populist support on his third attempt at the presidency.

Al Jazeera’s John Holman reports on the former mayor of Mexico City who has long polarised opinions.