[It] exists in a society to the degree that those enlisted in its contending interests have a basic minimal regard for each other: one party or interest seeks the defeat of an opposing interest on matters of policy, but at the same time seeks to avoid crushing the opposition, denying the legitimacy of its existence or its values, or inflicting upon it extreme and gratuitous humiliations beyond the substance of the gains that are being sought.
The basic humanity of the opposition is not forgotten; civility is not abandoned; the sense that a community life must be carried on after the acerbic issues of the moment have been fought over and won is seldom very far out of mind; an awareness that the opposition will someday be the government is always present