CNN driving me nuts

I am stuck listening to CNN today, and over and over again they are talking about the Buffet Rule and how it is only trying to make sure that Millionaires and Billionaires pay at least the same tax rate as the middle class.  But they never once mention the reason that taxes on dividends and the capital gains on stock are set lower than their income tax rate.  The notion that these wealthy are already paying the higher corporate income tax rates in the world on their share of what these companies earn and that these dividend and capital gains taxes are on top of that apparently is something that they have never heard about.