“Upon his inauguration as president of the United States, an office, even when assumed under the most favorable condition, fitted to tax and strain the largest abilities, Abraham Lincoln was met by a tremendous crisis. He was called upon not merely to administer the government, but to decide, in the face of terrible odds, the fate of the republic. A formidable rebellion rose in his path before him. The Union was already practically dissolved; his country was torn and rent asunder at the center. Hostile armies were already organized against the republic, armed with the munitions of war which the republic had provided for its own defense. The tremendous question for him to decide was whether his country should survive the crisis and flourish, or be dismembered and perish”

1960, Speech to the Greater Houston Ministerial Association
Context: That is the kind of America in which I believe. And it represents the kind of Presidency in which I believe — a great office that must neither be humbled by making it the instrument of any one religious group nor tarnished by arbitrarily withholding its occupancy from the members of any one religious group. I believe in a President whose religious views are his own private affair, neither imposed by him upon the nation or imposed by the nation upon him as a condition to holding that office.

Fraser resigning from cabinet on 8 March 1971 and denouncing John Gorton's leadership http://australianpolitics.com/1971/03/09/malcolm-frasers-resignation-speech.html

1960s, Emancipation Proclamation Centennial Address (1962)
Context: When Abraham Lincoln signed the Emancipation Proclamation it was not the act of an opportunistic politician issuing a hollow pronouncement to placate a pressure group. Our truly great presidents were tortured deep in their hearts by the race question. [... ] Lincoln’s torments are well known, his vacillations were facts. In the seething cauldron of ‘62 and ‘63 Lincoln was called the "Baboon President" in the North, and "coward", "assassin" and "savage" in the South. Yet he searched his way to the conclusions embodied in these words, "In giving freedom to the slave we assure freedom to the free, honorable alike in what we give and what we preserve." On this moral foundation he personally prepared the first draft of the Emancipation Proclamation, and to emphasize the decisiveness of his course he called his cabinet together and declared he was not seeking their advice as to its wisdom but only suggestions on subject matter. Lincoln achieved immortality because he issued the Emancipation Proclamation. His hesitation had not stayed his hand when historic necessity charted but one course. No President can be great, or even fit for office, if he attempts to accommodate to injustice to maintain his political balance.

1860s, Speech in Austin (1860)

1870s, Oratory in Memory of Abraham Lincoln (1876)
Context: Fellow citizens, ours is no new-born zeal and devotion — merely a thing of this moment. The name of Abraham Lincoln was near and dear to our hearts in the darkest and most perilous hours of the republic. We were no more ashamed of him when shrouded in clouds of darkness, of doubt, and defeat than when we saw him crowned with victory, honor, and glory. Our faith in him was often taxed and strained to the uttermost, but it never failed. When he tarried long in the mountain; when he strangely told us that we were the cause of the war; when he still more strangely told us that we were to leave the land in which we were born; when he refused to employ our arms in defense of the Union; when, after accepting our services as colored soldiers, he refused to retaliate our murder and torture as colored prisoners; when he told us he would save the Union if he could with slavery; when he revoked the Proclamation of Emancipation of General Fremont; when he refused to remove the popular commander of the Army of the Potomac, in the days of its inaction and defeat, who was more zealous in his efforts to protect slavery than to suppress rebellion; when we saw all this, and more, we were at times grieved, stunned, and greatly bewildered; but our hearts believed while they ached and bled. Nor was this, even at that time, a blind and unreasoning superstition. Despite the mist and haze that surrounded him; despite the tumult, the hurry, and confusion of the hour, we were able to take a comprehensive view of Abraham Lincoln, and to make reasonable allowance for the circumstances of his position. We saw him, measured him, and estimated him; not by stray utterances to injudicious and tedious delegations, who often tried his patience; not by isolated facts torn from their connection; not by any partial and imperfect glimpses, caught at inopportune moments; but by a broad survey, in the light of the stern logic of great events, and in view of that divinity which shapes our ends, rough hew them how we will, we came to the conclusion that the hour and the man of our redemption had somehow met in the person of Abraham Lincoln. It mattered little to us what language he might employ on special occasions; it mattered little to us, when we fully knew him, whether he was swift or slow in his movements; it was enough for us that Abraham Lincoln was at the head of a great movement, and was in living and earnest sympathy with that movement, which, in the nature of things, must go on until slavery should be utterly and forever abolished in the United States.

1920s, Proclamation Upon the Death of Woodrow Wilson (1924)

1910s, California's Policies Proclaimed (Feb. 21, 1911)

"Remarks at the Birthplace of Abraham Lincoln" http://www.eisenhowermemorial.org/speeches/19540423%20Remarks%20at%20the%20Birthplace%20of%20Abraham%20Lincoln.htm, Hodgenville, Kentucky (April 23, 1954). The story originates http://books.google.com/books?id=AsrfAAAAMAAJ&pg=PA128 from F. A. Mitchel, son and aide of General Mitchel.
1950s

They died for their country.
1870s, The Unknown Loyal Dead (1871)