Why have Middle Class Wages Plummeted since Clinton Left office?

If you look at the charts showing middle class earnings during the 1990's thru now. They maxxed out around Bill Clintons last years in office. Then around 2002-2003, they start free falling. On the Flip side though, for the top earners, those in the top %10 range,, their earnings sky rocketed. Nearly doubled since 2000 Until now. This is a fact that can not be ignored, the middle class is Sinking, and sinking fast. As Americans, we can not ignore massive facts like these. We have been so side tracked with Al-Quadea, that we have forgotten about our neighbors. And the fact is the only political party who is talking about these statistics are democrats. I never hear the Tea party / Republican's / Fox News mention things like this. Is there some benefit to this that I don't understand? If the Middle class is smaller, and there is a larger poverty range, and richer rich people, does this help business? On top of all the stripping of workers rights, and promises of abolishing minimum wage, from folks like Michelle Bachmann and Rand Paul... Do those things help the middle class? The average middle class worker in 1990 earned $20.00 Per hour. and made 41k a year. Today? It's $14.80 per hour and 30k per year.