I am not surprised a guy named Gore (a typical name among the traditional border bandits in Scotland) adopted the song as his campaign theme.
The Gypsies usually become Catholics in Catholic countries, and Orthodox in Orthodox countries. In America they can do whatever they want ~ several years back ~ much to my surprise and distress ~ they were proselytizing on behalf of the Church of the First Born!
Apparently that group had infiltrated the carnival racket and picked up Traveler and Gypsy members. Actually, COTFB marriage customs make more sense than traditional Traveler/Gypsy customs ~ this is a big place, men have to travel farther to get work, and it's much harder to get together with other Travelers/Gypsies to make marriage arrangements.