I'm usually pretty skeptical when politicians complain about "tax cuts only for the wealthy". The fact is that the poorest people in the country pay a rather small fraction of the overall tax burden, so it is fundamentally impossible to construct a tax cut that helps them proportionally more than the upper income levels. People who pay more tax are always going to benefit more from tax cuts, and that is exactly how it should be.
However, "W"'s latest proposal goes much further than that. It doesn't even TRY to be an across-the-board cut. The only people who can possibly benefit from the elimination of the tax on corporate dividends are people who own stock outside of their retirement funds. And, like it or not, only the wealthiest people in this country fall into that category.
If George wants to help middle-income America, he would reduce the tax on bank and savings & loan interest. If he really wants to help low-income America, he would nationalize health care, but that's a topic for another day.