How is the Democratic party responsible for that excitement, and for the difference of opinion which pervades the Republic on that subject, threatening a dissolution of the Union? Why, we are responsible for it because we do not join the Republican party to exclude slavery from the Territories? We are responsible for it because we do not oppose the admission of a State into the Union when her constitution tolerates slavery. We are responsible for it because we do not join in the declaration that all men are created free and equal, and apply that doctrine to the African slaves of the South; because we do not declare that those slaves are equal to us, and therefore of right free. We are required by the Republican party to unite with them in advocating that doctrine, and to declare besides that slavery and polygamy are twin relics of barbarism. If we join them in all these declarations of principle; if we join them in advocating these measures, then, of course, the country will be quiet. But, sir, who is responsible for the agitation? Is it not the party that calls for legislation? Has the Democratic party ever asked the national Legislature to establish slavery in her Territory? No, sir; but the Republican party comes into this Hall and demands that the power of the Government should be interposed to exclude slavery from the Territories. Because we do not agree with them; because we do not think as they do; and because we do not vote as they do; because we do not acquiesce in these propositions, why, then we are responsible for this agitation, and they are not! They ask us to adopt the maxim that no more slave States shall be admitted into the Union, and because we do not agree with them on that subject, we are the agitators, and they are not. Mr. Chairman, from what source do we learn this new doctrine? Do we find it in the legislation of our forefathers? Are there any restrictions in the Constitution of the United States on the subject, or any grant of power to prohibit slavery in a Territory when that Territory is organized? Is there anything in the Constitution of the United States to justify it--and I appeal to that as the very first example of our forefathers in the administration of this Government--is there anything in that instrument which authorizes you to say that a State shall not be admitted into the Union because its constitution tolerates slavery?