For myself, fellow-citizens, my own course is determined. The first political convention which I ever attended was in the spring of 1845, against the annexation of Texas. I was at that time a silent and passive Whig. I had never held political office, nor been a candidate for any. No question ever before drew me to any active political exertion. The strife of politics seemed to me ignoble. A desire to do what I could against Slavery led me subsequently to attend two different State Conventions of Whigs, where I coöperated with eminent citizens in endeavor to arouse the party in Massachusetts to its Antislavery duties. A conviction that the Whig party was disloyal to Freedom, and an ardent aspiration to help the advancement of this great cause, has led me to leave that party, and dedicate what of strength and ability I have to the present movement. [_Great applause._] To vindicate Freedom, and oppose Slavery, so far as I may constitutionally,--with earnestness, and yet, I trust, without personal unkindness on my part,--is the object near my heart. Would that I could impress upon all who now hear me something of the strength of my own convictions! Would that my voice, leaving this crowded hall to-night, could traverse the hills and valleys of New England, that it could run along the rivers and the lakes of my country, lighting in every heart a beacon-flame to arouse the slumberers throughout the land! [_Sensation._] In this cause I care not for the name by which I am called. Let it be Democrat, or "Loco-foco," if you please. No man in earnest will hesitate on account of a name. Rejoicing in associates from any quarter, I shall be found ever with that party which most truly represents the principles of Freedom. [_Applause._] Others may become indifferent to these principles, bartering them for political success, vain and short-lived, or forgetting the visions of youth in the dreams of age. Whenever I forget them, whenever I become indifferent to them, whenever I cease to be constant in maintaining them, through good report and evil report, in any future combinations of party, then may my tongue cleave to the roof of my mouth, may my right hand forget its cunning! [_Cheers._] And now as I close, fellow-citizens, I return in thought to the political election with which I began. If from this place I could make myself heard by the friends of Freedom throughout the Commonwealth, I would give them for a rallying-cry three words,--FREEDOM, UNION, VICTORY! The peroration was received with the most earnest applause, followed by cries of "_Three cheers for Charles Sumner!_" "_Three cheers for Phillips and Walker!_" "_Three cheers for Horace Mann and the cause!_" * * * * * ACCEPTANCE OF THE OFFICE OF SENATOR OF THE UNITED STATES. LETTER TO THE LEGISLATURE OF MASSACHUSETTS, MAY 14, 1851.