"The people themselves have it in their power effectually to resist usurpation, [the wrongful seizure of authority] without being driven to an appeal to arms. An act of usurpation is not obligatory; it is not law; and any man may be justified in his resistance. Let him be considered as a criminal by the general government, yet only his fellow citizens can convict him; they are his jury, and if they pronounce him innocent, not all the powers of Congress can hurt him; and innocent they certainly will pronounce him, if the supposed law he resisted was an act of usurpation."
But I don't have the weasily language in the majority opinion handy that they now use to relegate jury nullification to a "secret rogue power."