Brigham Young acknowledges that "outsiders" object to LDS block voting; justifies it as it allows the Kingdom to be established in righteousness.
Brigham Young, "Preaching the Gospel—the Principles and Spirit of the Same," Journal of Discourses, 26 vols. (Liverpool: Horace S. Eldredge, 1871), 13:219
This is the one objection which outsiders have to the Latter-day Saints: they all go and vote one way. Is it not right to do so? Let us think about it. Suppose that we do all actually vote one way, or for one man for our delegate to Congress, and have no opposing candidate, and get the best there is, is that not better than having opposition? What does opposition bring? It certainly brings anger and strife; and of what use are they? They serve no good purpose. Then let us all vote one way, and think and act one way, and keep the commandments of God and build up His kingdom on the earth in peace and righteousness. I certainly think that this is the best idea. We have plenty of competition in our midst, but what will it accomplish? Not much, if anything. They who favor it may contend until they are tired, and then they will drop silently out of the way, and that will be the end of them. Contention does not profit a people.