The article says that the Teamster's Union is one of the largest unions. It contribute huge amounts of money to political parties and individual candidates. This gives them a lot of power. I'm not so sure I agree that any union or group should have this much power to influence choices made by politicians.
I don't know how much the Teamsters Union contributes, but I personally think that there ought to be limits to how much a group can contribute to a campaign or to politicians.
I just don't like to see things done that benefit one group of people to the detriment of others.