Concerning Prop. 8 in California, here are a few quotes from church leaders.
First Presidency Letter read to all congregations in California on 29 June 2008 reads in part:
"The Church’s teachings and position on this moral issue are unequivocal. Marriage between a man and a woman is ordained of God, and the formation of families is central to the Creator’s plan for His children. Children are entitled to be born within this bond of marriage.
"We ask that you do all you can to support the proposed constitutional amendment by donating of your means and time to assure that marriage in California is legally defined as being between a man and a woman. Our best efforts are required to preserve the sacred institution of marriage."
Elder Neal A. Maxwell speaking before an audience at Brigham Young University said:
"Discipleship includes good citizenship; and in this connection, if you are careful students of the statements of the modern prophets, you will have noticed that with rare exceptions–especially when the First Presidency has spoken out–the concerns expressed have been over moral issues, not issues between political parties. The declarations are about principles, not people, and causes, not candidates.
"But make no mistake about it, brothers and sisters; in the months and years ahead, events will require of each member that he or she decide whether or not he or she will follow the First Presidency. Members will find it more difficult to halt longer between two opinions (see 1 Kings 18:21)
"President Marion G. Romney said, many years ago, that he had “never hesitated to follow the counsel of the Authorities of the Church even though it crossed my social, professional, or political life” (CR, April 1941, p. 123). This is a hard doctrine, but it is a particularly vital doctrine in a society which is becoming more wicked. In short, brothers and sisters, not being ashamed of the gospel of Jesus Christ includes not being ashamed of the prophets of Jesus Christ.
"We are now entering a period of incredible ironies. Let us cite but one of these ironies which is yet in its subtle stages: we shall see in our time a maximum if indirect effort made to establish irreligion as the state religion. It is actually a new form of paganism that uses the carefully preserved and cultivated freedoms of Western civilization to shrink freedom even as it rejects the value essence of our rich Judeo-Christian heritage.
"This new irreligious imperialism seeks to disallow certain of people’s opinions simply because those opinions grow out of religious convictions. Resistance to abortion will soon be seen as primitive. Concern over the institution of the family will be viewed as untrendy and unenlightened."
President Gordon B. Hinckley said in his conference talk “Loyalty:”
“Now may I say a word concerning loyalty to the Church. We see much indifference. There are those who say, ‘The Church won’t dictate to me how to think about this, that, or the other, or how to live my life.’
"No, I reply, the Church will not dictate to any man how he should think or what he should do. The Church will point out the way and invite every member to live the gospel and enjoy the blessings that come of such living. The Church will not dictate to any man, but it will counsel, it will persuade, it will urge, and it will expect loyalty from those who profess membership therein.
"When I was a university student, I said to my father on one occasion that I felt the General Authorities had overstepped their prerogatives when they advocated a certain thing. He was a very wise and good man. He said, ‘The President of the Church has instructed us, and I sustain him as prophet, seer, and revelator and intend to follow his counsel.’
"I have now served in the general councils of this Church for 45 years. I have served as an Assistant to the Twelve, as a member of the Twelve, as a Counselor in the First Presidency, and now for eight years as President. I want to give you my testimony that although I have sat in literally thousands of meetings where Church policies and programs have been discussed, I have never been in one where the guidance of the Lord was not sought nor where there was any desire on the part of anyone present to advocate or do anything which would be injurious or coercive to anyone.
"The book of Revelation declares: ‘I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot. ‘So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth’ (Rev. 3:15–16).
“I make you a promise, my dear brethren, that while I am serving in my present responsibility I will never consent to nor advocate any policy, any program, any doctrine which will be otherwise than beneficial to the membership of this, the Lord’s Church.
“This is His work. He established it. He has revealed its doctrine. He has outlined its practices. He created its government. It is His work and His kingdom, and He has said, ‘They who are not for me are against me’ (2 Ne. 10:16).
“In 1933 there was a movement in the United States to overturn the law which prohibited commerce in alcoholic beverages. When it came to a vote, Utah was the deciding state.
“I was on a mission, working in London, England, when I read the newspaper headlines that screamed, “Utah Kills Prohibition. President Heber J. Grant, then President of this Church, had pleaded with our people against voting to nullify Prohibition. It broke his heart when so many members of the Church in this state disregarded his counsel.
"On this occasion I am going to talk of uncompromising loyalty to the Church. Each of us has to face the matter—either the Church is true, or it is a fraud. There is no middle ground. It is the Church and kingdom of God, or it is nothing."