The United States Grand Jury at Springfield invited him to address the people of that city on the questions of the time. He spoke on the 12th of June, 1857, to a large and enthusiastic audience. He assured the people that he cordially accepted the decision and that it was in perfect harmony with his favorite doctrine of squatter sovereignty. The master's right to his slave in the Territories he admitted was guaranteed by the Constitution and neither Congress nor the legislature could interfere with it; yet practically this right was worthless unless sustained, protected and enforced by appropriate police regulations and local legislation prescribing adequate remedies for its violation. These regulations and remedies must depend entirely upon the will and wishes of the people of the Territory, as they could only be prescribed by the local legislature. Hence, the great principle of popular sovereignty and self-government was sustained and firmly established by the authority of the decision. Perhaps, as pointed out by a recent historian, it would have been wiser for Douglas to have planted himself on the sound legal proposition that the only question decided by the Court was that it had no jurisdiction of the cause and that everything in the opinion beyond this was mere obiter dicta determining nothing. But it was no easy matter for a politician in 1857 to explain to a popular audience that a small fraction of the opinion of the highest Court was binding, while the remainder was merely the private opinion of the Judges on a matter not before them. Had Douglas been defending his opinions before a bench of trained jurists he might have safely rested his case on this sound but technical rule. He afterwards did so justify his opinions in the Senate. An experience politician determined to carry a popular election in a dangerous crisis might well hesitate to attempt so doubtful an experiment. History would have less temptation to call him a demagogue had he pursued that course. But we may well doubt whether, considered as a problem of practical politics, he was not wise in depending on his ingenious sophistry, rather than on this sound legal proposition. Two weeks after his speech Lincoln addressed the people of Springfield in reply, pointing out the fallacy of Douglas' chief argument. But Lincoln was still an obscure lawyer; Douglas was the omnipotent Senator whose ipse dixit was final and carried conviction to the uncritical multitude. Chapter XI. Popular Sovereignty in Congress. While the Supreme Court was dedicating the Territories to slavery and Douglas was preaching local nullification, anarchy continued its delirious dance in Kansas. Guerilla warfare continued to vex the Territory as with unconscious humor the settlers illustrated the doctrine of popular sovereignty in practical operation.