MEXICO CITY (AP) — Mexico goes into Sunday’s election deeply divided: friends and relatives no longer talk politics for fear of worsening unbridgeable divides, while drug cartels have split the country into a patchwork quilt of warring fiefdoms. The atmosphere is literally heating up, amid a wave of unusual heat, drought, pollution and political violence.

It’s unclear whether Mexico’s next president will be able to rein in the underlying violence and polarization.