Xóchitl Gálvez and Claudia Sheinbaum visit the Vatican in search of the Catholic electorate. Religion is a powerful ally and fierce adversary, writes Ruben Navarrette.

It is never easy to guess who the votes of the electorate that declare themselves Catholic are for, he says. The meeting with Francisco was like one of those old door comedies, Navarrete says. It is unknown who Francis' successor will be, but it is unknown if it will be divine or human.