Why is Lobbying protected by the First Amendment?

The right to free speech is the first ammendment of the United States Constitution. That right basically gives lobbyists a free ticket because they can just say they are exercising their right to free speech. In some ways, that is true but when their free speech is used to manipulate and get their way within the government with laws and regulations for their own selfish reasons, that's not right.

Sometimes there are good and just causes they represent but more often than not, they have to do with greed and buying power through lobbying. This is where government basically turns corrupt because something that might should be illegal is allowed because of a loophole and that loophole is...the first ammendment.