"The legislation thus proposed invades the judicial power of the State. It says to every State court or judge, If you decide that this act is unconstitutional; if you refuse, under the prohibition of a State law, to allow a negro to testify; if you hold that over such a subject-matter the State law is paramount, and 'under color' of a State law refuse the exercise of the right to the negro, your error of judgment, however conscientious, shall subject you to fine and imprisonment. I do not apprehend that the conflicting legislation which the bill seems to contemplate is so likely to occur as to render it necessary at this time to adopt a measure of such doubtful constitutionality. "In the next place, this provision of the bill seems to be unnecessary, as adequate judicial remedies could be adopted to secure the desired end without invading the immunities of legislators, always important to be preserved in the interest of public liberty; without assailing the independence of the judiciary, always essential to the preservation of individual rights; and without impairing the efficiency of ministerial officers, always necessary for the maintenance of public peace and order. The remedy proposed by this section seems to be, in this respect, not only anomalous, but unconstitutional; for the Constitution guarantees nothing with certainty, if it does not insure to the several States the right of making and executing laws in regard to all matters arising within their jurisdiction, subject only to the restriction that, in cases of conflict with the Constitution and constitutional laws of the United States, the latter should be held to be the supreme law of the land.