This collection of talks from LDS leaders contains:
"In my feelings I am always ready to die for the protection of the weak and oppressed in their just rights. The only fault I find with the Constitution is, it is not broad enough to cover the whole ground." - Joseph Smith
"My cogitations, like Daniel's, have for a long time troubled me, when I viewed the condition of men throughout the world, and more especially in this boasted realm, where the Declaration of Independence holds these truths to be self-evident, that all men are created equal . . . but at the same time some two or three millions of people are held as slaves for life, because the spirit in them is covered with a darker skin than ours." - Joseph Smith
“I attended a second lecture on Socialism, by Mr. Finch; and after he got through, I made a few remarks … I said I did not believe the doctrine.” - Joseph Smith
"The political organization upon the land was designed by heaven to be a protection to the righteous. 'But,' says one, 'is it not designed to protect the wicked?' No, not in wicked acts, but in their freedom and liberty, to think and to speak and to act, and to choose for themselves." - Erastus Snow
"If men could prove to us that we are wrong, then they might have some chance of converting us. But when they trample upon our inalienable rights, upon our constitutional privileges, upon religious liberty, why, then, we feel like resisting. But we are not going to fight." Charles Penrose
"Even in our own land there are some who seem to think that our Constitution is unfriendly to religion. On the contrary, it is intended to encourage and protect all religions. It simply means 'equal rights to all, but special privileges to none,'—no state religion, but no interference with any. This is holy ground. To Congress it says, 'hands off.'" - Rulon Wells
"Inequality is a law of all social life, and to try to do away with inequality among men is to substitute tyranny for liberty." - Levi Edgar Young
"Education is the only way to reach the ideal in our souls of what our government really means." Levi Edgar Young
"[The founders] had a surprisingly accurate knowledge of the course of all governments within the period of recorded history and had learned that power once bestowed tends ever towards its own expansion." - Albert Bowen
"To hold that the founders were heaven-guided does not signify, neither do I believe, that the Constitution was written by the finger of God, nor that it sprang full grown either from the forehead of Jove or Jehovah." -Albert Bowen
"[The Constitution's] highest sanctions are free speech, free press, free election, a free legislature, a free judiciary, and a definite limitation upon the powers of government over the lives of men." - Albert Bowen
"The powers of the Federal Government are to be found in the explicit grants made in [the Constitution] and in them only." - J. Reuben Clark
"[The founders] saw clearly that the power to tax the individual gave the power to control him, so they left this power in the sates to be handled under local self-government." -J. Reuben Clark
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I see three movements:
1830-1860 - LDS leaders feel the federal government didn't do enough to protect them.
1860-1960 - LDS leaders feel strong skepticism toward concentrated power at the federal level (evidenced in the quotes above)
1960-present - LDS leaders worry about the rise of secularism and the decline of religious freedom.