This is about the best explanation you're ever going to see:
Politics is the art of telling people what they want to hear and then doing what’s expedient, according to the dictates of power and money. It’s basically the art of the deal. Deals are accomplished through compromise. It’s quid pro quo. It’s been said that ‘the devil is in the details’ and that is what deals contain, details. Details require lawyers. The job of a lawyer is to find the loopholes and exceptions to the law, so that the law can be bent to accommodate the needs of the deal. Eventually, the law no longer operates according to its tenets and the only place it applies is to the living conditions of those too poor to afford lawyers, at the whim of those who can. -- Les Visible
Source: The Base of the Mountain and the Wheel of Fire.