"Political rights do not originate in parliaments; they are rather forced upon them from without. And even their enactment into law has for a long time been no guarantee of their security. They do not exist because they have been legally set down on a piece of paper, but only when they have become the ingrown habit of a people, and when any attempt to impair them will meet with the violent resistance of the populace."
--Rudolph Rocker, Anarcho-Syndicalism, 1902

This "radical" idea is part of the thinking of the framers. Alexander Hamilton put it this way in Federalist 84:

What is the liberty of the press? Who can give it any definition which would not leave the utmost latitude for evasion? I hold it to be impracticable; and from this I infer, that its security, whatever fine declarations may be inserted in any constitution respecting it, must altogether depend on public opinion, and on the general spirit of the people and of the government. And here, after all, as is intimated upon another occasion, must we seek for the only solid basis of all our rights.