believe you are misinterpreting the 1st amendment.  there is nothing in it that states whatever one states must be true.  it merely states that everyone has a right to express their opinion in a setting that does not injure others.  for example, one cannot call out "fire" in a crowded room when there is no fire.  but you can say anything you like as long as it is civil and does not damage a person's reputation, etc.  btw, special interest groups can express their opinions and it does not need to be true, the same as everyone else.