"We must recognize that it is a cardinal sin against democracy to support a man for public office because he belongs to a given creed or to oppose him because he belongs to a given creed. It is just as evil as to draw the line between class and class, between occupation and occupation in political life. No man who tries to draw either line is a good American. True Americanism demands that we judge each man on his conduct, that we so judge him in private life and that we so judge him in public life."