Claudia Sheinbaum is poised to become Mexico’s next president. With a history of political activism, she aims to step out of President AMLO’s shadow and address challenges in a nation plagued by violence and instability.

Fuming, Claudia Sheinbaum was.

The presidential candidate started her party's primary last summer with a sizable lead in the polls. However, several of the supporters of her main challenger stopped her one afternoon as she was checking into a hotel for a meeting, sh...