The key question is whether Claudia Sheinbaum will just be a stand-in president in public while Andres Manuel Lopez Obrador is behind the curtain, pulling the strings.
Mexican general election to happen this weekend, what you need to know if you are voting kvia.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from kvia.com Daily Mail and Mail on Sunday newspapers.
Claudia Sheinbaum will be the ruling party of Mexico's presidential candidate next year, moving the country closer to electing its first female president.