1.Some interest groups have an influence far out of proportion to their size, or, for that matter, to the public good. Thus, the contest over"who gets what, when, and how" is always a fair fight.
2.It is sometimes hard to tell just who or how many people a group really represents. Many groups have titles that suggests that they have thousands-even millions-of dedicated members. Some organizations that call themselzes such things as "The American Citizens Committee for..."
3.Many groups do not in fact represent the views of all of the people for whom they claim to speak. Very often, both in and out of politics, an organization is dominated by an active minority who conduct the group's affairs and make its policy decisions.
4.Finally, some groups use tactics that, if they were to become widespread, would undermine the whole political system. These practicws include bribery and other heavey-handed uses of money, overt threats of revenge, and so on.