A powerful tool of the Mormon faith is the belief that they are led by 12 apostles and a prophet. These people are not "in name only" but of the stay line as Peter,Paul and John. They claim the same abilities and hence the same authority as the New Testament apostles. When confronted with clear error they will reply that God would never allow His messengers to speak falsehood, so it must be you who is confused. After all your church does not have even one apostle. They believe all non-Mormon apostles are bogus.
They accept much like many other churches, the claims of supernatural abilities by their leaders as proof of their office.
This is taught by the Mormon Church and is accepted by all Mormons. To see this first hand go to chatwithamormon.com and ask them yourself.
Their train of thought is no different then most Pentecostals and charismatics. "How can we be wrong when God has given us this supernatural gift??