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Under President Bush the share of tax revenue paid by the wealthiest earners has gone up, not down. In fact, the share of tax revenue paid by the top 1%, top 5%, and top 10% of earners is the highest it's been in decades.
The Top 50% of earners now pays 97.01% of tax revenues generated by the personal income tax. The bottom 50% picks up the tab for 2.99%. Which of course means there is a built-in constituency of 50% for a presidential candidate who promises to raise taxes on the rich. Funny how that works out, huh?