One of the reasons that many of 'the rich' are liberal is that they know that to "stay ahead of the Jones'" they have to continue to innovate with their wealth, or at least keep others from reaching their net worth via socialist policies that make it tougher for others to make money.
I skimmed this twice looking for Mr. Kurth's solution to his perceived increase in income inequality, and didn't see it . . . anybody?
The funny thing is...if you divide US Household income by 5. Take the bottom 5th and top 5th of incomes. Those two groups vote majority Democrat. The three in the middle lean Republican.