Recently I co-wrote with Omar García-Ponce a short piece on the difficulties of measuring an armed group's lethality using data from the Mexican drug war. The post was originally published by the Political Violence at a Glance webpage.
In general it is not that hard to get data on Mexico at the municipal level. The databases for the INEGI are relatively easy to access and work with, as well as most electoral data from the INE at the national level. However, the data for local elections is not centralized, making it a painstaking task to get information for election results Read more about Who Governs Mexico's Municipalities? (A Database)