How much of the racial voting differences are simply due to age and income?

[Benj]

I think the question should be asked the other way around. How much of the age and income voting differences are due to race? After all, poor whites vote not that differently from rich whites, and the same for poor blacks and rich blacks, and for poor Asians and rich Asians. Only Hispanics seem to have much polarization in voting patterns by income. And minorities are much more heavily represented among the youth than the elderly. The 65+ population is something like 85% white. The 18-25 population is maybe 60% white at most (and the infant population, obviously not voting yet, but just wait a couple decades, is minority-majority!).