James Madison, The Report of 1800:

Again, it is no less obvious, that the intent to defame or bring into contempt or disrepute, or hatred, which is made a condition of the offence created by the act; cannot prevent its pernicious influence, on the freedom of the press. For omitting the enquiry, how far the malice of the intent is an inference of the law from the mere publication; it is manifestly impossible to punish the intent to bring those who administer the government into disrepute or contempt, without striking at the right of freely discussing public characters and measures: because those who engage in such discussions, must expect and intend to excite these unfavorable sentiments, so far as they may be thought to be deserved. To prohibit therefore the intent to excite those unfavorable sentiments against those who administer the government, is equivalent to a prohibition of the actual excitement of them; and to prohibit the actual excitement of them, is equivalent to a prohibition of discussions having that tendency and effect; which, again, is equivalent to a protection of those who administer the government, if they should at any time deserve the contempt or hatred of the people, against being exposed to it, by free animadversions on their characters and conduct. Nor can there be a doubt, if those in public trust be shielded by penal laws from such strictures of the press, as may expose them to contempt or disrepute, or hatred, where they may deserve it, that in exact proportion as they may deserve to be exposed, will be the certainty and criminality of the intent to expose them, and the vigilance of prosecuting and punishing it; nor a doubt, that a government thus intrenched in penal statutes, against the just and natural effects of a culpable administration, will easily evade the responsibility, which is essential to a faithful discharge of its duty.