"If, then, the control of the people over the organs of their government be the measure of its republicanism, and I confess I know no other measure, it must be agreed that our governments have much less of republicanism than ought to have been expected; in other words, that the people have less regular control over their agents, than their rights and their interests require."
-- Thomas Jefferson, letter to John Taylor, 1816
"What is to be the consequence, in case the Congress shall misconstrue this part [the necessary and proper clause] of the Constitution and exercise powers not warranted by its true meaning, I answer the same as if they should misconstrue or enlarge any other power vested in them ... the success of the usurpation will depend on the executive and judiciary departments, which are to expound and give effect to the legislative acts; and in a last resort a remedy must be obtained from the people, who can by the elections of more faithful representatives, annul the acts of the usurpers."
-- James Madison, Federalist No. 44, 1788