The page contains excerpts of speeches that cite (or in some cases I think cite) the Preamble to the Declaration of Independence or the Preamble to the Constitution or both. I have italicized where the most direct reference to the Preambles are made:

Frederick Douglass Lessons of the Hour, January 9, 1894- you can read full speech (it’s long) at source

“But, my friends, I must stop. Time and strength are not equal to the task before me. But could I be heard by this great nation, I would call to mind the sublime and glorious truths with which, at its birth, it saluted a listening world. Its voice then, was as the trump of an archangel, summoning hoary forms of oppression and time honored tyranny, to judgement. Crowned heads heard it and shrieked. Toiling millions heard it and clapped their hands for joy. It announced the advent of a nation, based upon human brotherhood and the self-evident truths of liberty and equality. Its mission was the redemption of the world from the bondage of ages. Apply these sublime and glorious truths to the situation now before you. Put away your race prejudice. Banish the idea that one class must rule over another. Recognize the fact that the rights of the humblest citizen are as worthy of protection as are those of the highest, and your problem will be solved; and, whatever may be in store for it in the future, whether prosperity, or adversity; whether it shall have foes without, or foes within, whether there shall be peace, or war; based upon the eternal principles of truth, justice and humanity, and with no class having any cause of complaint or grievance, your Republic will stand and flourish forever.”

Abraham Lincoln Gettysburg Address, November 19, 1863- you can read full speech at source.

“Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battlefield of that war. We have come to dedicate a portion of that field as a final resting place for those who here gave their lives that that nation might live…It is rather for us to be here dedicated to the great task remaining before us, that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion, that we here highly resolve that these dead shall not have died in vain, that this nation, under God, shall have a new birth of freedom, and that government of the people, by the people, for the people, shall not perish from the earth.”

John F Kennedy Inaugural Address, January 20, 1961- you can read full speech here at source.

We observe today not a victory of party but a celebration of freedom--symbolizing an end as well as a beginning--signifying renewal as well as change. For I have sworn before you and Almighty God the same solemn oath our forbears prescribed nearly a century and three-quarters ago.

The world is very different now. For man holds in his mortal hands the power to abolish all forms of human poverty and all forms of human life. And yet the same revolutionary beliefs for which our forebears fought are still at issue around the globe--the belief that the rights of man come not from the generosity of the state but from the hand of God.

We dare not forget today that we are the heirs of that first revolution. Let the word go forth from this time and place, to friend and foe alike, that the torch has been passed to a new generation of Americans--born in this century, tempered by war, disciplined by a hard and bitter peace, proud of our ancient heritage--and unwilling to witness or permit the slow undoing of those human rights to which this nation has always been committed, and to which we are committed today at home and around the world.

Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of liberty.

Martin Luther King, Jr. I have a Dream Speech, August 28, 1963- you can read the full speech at source.

“…When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to fall heir. This note was a promise that all men — yes, Black men as well as white men — would be guaranteed the unalienable rights of life, liberty and the pursuit of happiness.

It is obvious today that America has defaulted on this promissory note insofar as her citizens of color are concerned. Instead of honoring this sacred obligation, America has given the Negro people a bad check, a check which has come back marked insufficient funds.

But we refuse to believe that the bank of justice is bankrupt. We refuse to believe that there are insufficient funds in the great vaults of opportunity of this nation. And so we've come to cash this check, a check that will give us upon demand the riches of freedom and the security of justice…”

“…So even though we face the difficulties of today and tomorrow, I still have a dream. It is a dream deeply rooted in the American dream. I have a dream that one day this nation will rise up and live out the true meaning of its creed: We hold these truths to be self-evident, that all men are created equal.”

President Lyndon Johnson Speech Before Congress on Voting Rights, March 15, 1965- you can read full transcript at source:

“…In our time we have come to live with moments of great crisis. Our lives have been marked with debate about great issues; issues of war and peace, issues of prosperity and depression. But rarely in any time does an issue lay bare the secret heart of America itself. Rarely are we met with a challenge, not to our growth or abundance, our welfare or our security, but rather to the values and the purposes and the meaning of our beloved Nation…

This was the first nation in the history of the world to be founded with a purpose. The great phrases of that purpose still sound in every American heart, North and South: "All men are created equal"—"government by consent of the governed"—"give me liberty or give me death." Well, those are not just clever words, or those are not just empty theories. In their name Americans have fought and died for two centuries, and tonight around the world they stand there as guardians of our liberty, risking their lives.

Those words are a promise to every citizen that he shall share in the dignity of man. This dignity cannot be found in a man's possessions; it cannot be found in his power, or in his position. It really rests on his right to be treated as a man equal in opportunity to all others. It says that he shall share in freedom, he shall choose his leaders, educate his children, and provide for his family according to his ability and his merits as a human being…

…There is no issue of States rights or national rights. There is only the struggle for human rights.”

Barack Obama First Inauguration Speech, January 29, 2009- you can read full transcript at source:

“Forty-four Americans have now taken the presidential oath. The words have been spoken during rising tides of prosperity and the still waters of peace. Yet, every so often the oath is taken amidst gathering clouds and raging storms. At these moments, America has carried on not simply because of the skill or vision of those in high office, but because We the People have remained faithful to the ideals of our forbearers, and true to our founding documents….We remain a young nation, but in the words of Scripture, the time has come to set aside childish things. The time has come to reaffirm our enduring spirit; to choose our better history; to carry forward that precious gift, that noble idea, passed on from generation to generation: the God-given promise that all are equal, all are free, and all deserve a chance to pursue their full measure of happiness.”

Meghan McCain’s Speech at John McCain’s Funeral Services, September 1, 2018; you can read full transcript at source:

“The America of John McCain is the America of Abraham Lincoln. Fulfilling the promise of the Declaration of Independence that all men are created equal and suffering greatly to see it through.”