Far from being a discredited political doctrine, nullification is, in actuality, a constitutionally consistent principle whereby sovereign states can defend their reserved rights and powers from federal acts of usurpation, most of which are motivated by partisan politics and power scheming. It is in every way consistent with the Constitution's fundamental principles, most notably the concepts of delegated powers and the separation of powers. Indeed, it should be recognized that it is not so much a state that nullifies a federal law or act, as it is the Constitution that does so, in that the Constitution limits what the federal government may rightfully do. Viewed in that light, nullification is really nothing more than a state saying to the federal government, "The Constitution does not authorize you to do this, therefore, we are not obligated to submit to you in this matter, and are choosing not to do so."
Campaign For Liberty — Nullification Revisited | by Robert Hawes