James Garfield
Now more than ever the people are responsible for the character of their Congress. If that body be ignorant, reckless, and corrupt, it is because the people tolerate ignorance, recklessness, and corruption. If it be intelligent, brave, and pure, it is because the people demand these high qualities to represent them in the national legislature. . . . [I]f the next centennial does not find us a great nation . . . it will be because those who represent the enterprise, the culture, and the morality of the nation do not aid in controlling the political forces.
[James A. Garfield, The Works of James Abram Garfield, Burke Hinsdale, editor (Boston: James R. Osgood and Company, 1883), Vol. II, pp. 486, 489, "A Century of Congress," July, 1877.]
John Adams
We electors have an important constitutional power placed in our hands: we have a check upon two branches of the legislature, as each branch has upon the other two; the power I mean of electing at stated periods, one branch, which branch has the power of electing another. It becomes necessary to every subject then, to be in some degree a statesman: and to examine and judge for himself of the tendencies of political principles and measures.
[John Adams, The Papers of John Adams, Robert J. Taylor, ed. (Cambridge: Belknap Press, 1977), Vol. 1, p. 81, from "'U' to the Boston Gazette" written on August 29, 1763.]
Samuel Adams

Let each citizen remember at the moment he is offering his vote that he is not making a present or a compliment to please an individual - or at least that he ought not so to do; but that he is executing one of the most solemn trusts in human society for which he is accountable to God and his country.
[Samuel Adams, The Writings of Samuel Adams, Harry Alonzo Cushing, editor (New York: G.P. Putnam's Sons, 1907), Vol. IV, p. 256, in the Boston Gazette on April 16, 1781.]
Matthias Burnett
Consider well the important trust . . . which God . . . [has] put into your hands. . . . To God and posterity you are accountable for [your rights and your rulers]. . . . Let not your children have reason to curse you for giving up those rights and prostrating those institutions which your fathers delivered to you. . . . [L]ook well to the characters and qualifications of those you elect and raise to office and places of trust. . . . Think not that your interests will be safe in the hands of the weak and ignorant; or faithfully managed by the impious, the dissolute and the immoral. Think not that men who acknowledge not the providence of God nor regard His laws will be uncorrupt in office, firm in defense of the righteous cause against the oppressor, or resolutly oppose the torrent of iniquity. . . . Watch over your liberties and privileges - civil and religious - with a careful eye.
[Matthias Burnett, Pastor of the First Baptist Church in Norwalk, An Election Sermon, Preached at Hartford, on the Day of the Anniversary Election, May 12, 1803 (Hartford: Printed by Hudson & Goodwin, 1803), pp. 27-28.]
Charles Finney
[T]he time has come that Christians must vote for honest men and take consistent ground in politics or the Lord will curse them. . . . Christians have been exceedingly guilty in this matter. But the time has come when they must act differently. . . . Christians seem to act as if they thought God did not see what they do in politics. But I tell you He does see it - and He will bless or curse this nation according to the course they [Christians] take [in politics].
[Charles G. Finney, Lectures on Revivals of Religion (New York: Fleming H. Revell Company, 1868), Lecture XV, pp. 281-282.]