Henrique Capriles is the first man in 14 years to unite Venezuela's opposition against the ruling socialist party.
This is Capriles's second presidential campaign in less than a year after Hugo Chavez, the country's charismatic president, died in March this year due to cancer.
It is expected that Venezuelans will turn out to the polls in large numbers, with their enthusiasm, in part, due to the opposition leader.
Al Jazeera's Teresa Bo reports from the capital, Caracas.
Source: Al Jazeera