But the virtue and courage of our politicians were now to be severely tried. The power of party discipline and the tempting bait of the spoils were to be employed as never before in swerving men from their convictions. The South, of course, was a perfect unit, and fully resolved upon the spread of slavery over our Territories. It had always been the absolute master of the Northern Democracy, and had no dream of anything less than the supremacy of its own will. Its favorite candidate was now Gen. Cass, and he was nominated by the Baltimore National Convention on the 22d day of May. It was a fit nomination for the party of slavery. He had been thirsting for it many years, and had earned it by multiplied acts of the most obsequious and crouching servility to his Southern overseers. Again and again he had crawled in the dust at their feet, and, if they could not now reward him with the presidency, it seemed utterly useless for any Northern man to hope for their favor. The "Nicholson letter" was not all that the South wanted, but it was a very important concession, and with Gen. Cass as its interpreter it meant the nearest thing possible to a complete surrender. In this National Convention the State of New York had two sets of delegates, both of which were formally admitted, as a compromise; but the members of the Van Buren or Free Soil wing refused to take their seats, and thus held themselves in reserve for such revolutionary work as should afterward seem to them advisable.