The LDS choose to identify themselves as apart from protestant, catholic, orthodox or jewish. Their theology does have definite quirks that set them apart. I don't say that to denigrate them; we've had LDS serve honorably enough in government long since, without trucking in the kind of baggage that a bunch of the current candidates from "real Christian" denominations are proudly packing around. To my own mind, LDS are just a subspecies of fundamentalists.