The Sunday bulletin of San Diego’s Immaculate Conception Catholic Church on Oct. 16 wasn’t very different from all the others. Seven pages. A welcome to newcomers. A Mass schedule. But there, between the prayers of healing for the ill and the deployed and a reminder about a parent-child chastity luncheon for ages 11 and up, was an extra flier. On it was printed a memo, written in Spanish and English, and titled, in part, “How to vote like a Catholic.” “It is a mortal sin to vote Democrat … immediately after death the souls of those who die in a...