The candidates choose comfortable territories to show their strength at the start of the campaign. Xóchitl Gálvez begins at midnight on Thursday in Fresnillo, but will dawn in the state capital, Zacatecas.

Claudia Sheinbaum, Morena's standard-bearer, will present her program in the capital's Zócalo. Jorge Álvarez Máynez will visit Sonora, Jalisco and Nuevo León this weekend.