While he thus saved himself from the social intercourse which for Roosevelt was a relaxation but which for him would have proved a nervous and physical drain, Wilson deprived himself of the political advantages that might have been derived from more extensive hospitality. He was unable to influence Congressmen except by reason of his authority as head of the party or nation. He lost many a chance of removing political opposition through the personal appeal which is so flattering and effective. He seems to have thought that if his policy was right in itself, Congressmen ought to vote for it, without the satisfaction of personal arguments, a singular misappreciation of human nature. The same was true of his relations with the Washington correspondents; he was never able to establish a man to man basis of intercourse. This incapacity in the vital matter of human contacts was, perhaps, his greatest political weakness. If he had been able to arouse warm personal devotion in his followers, if he could have inflamed them with enthusiasm such as that inspired by Roosevelt, rather than mere admiration, Wilson would have found his political task immeasurably lightened. It is not surprising that his mistakes in tactics should have been so numerous. His isolation and dependence upon tactical advisers, such as Tumulty and Burleson, lacking broad vision, led him into serious errors, most of which--such as his appeal for a Democratic Congress in 1918, his selection of the personnel of the Peace Commission, his refusal to compromise with the "mild reservationist Senators" in the summer of 1919--were committed, significantly, when he was not in immediate contact with Colonel House.