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I thought I was pretty clear that I was writing about central-city poverty. Any census report from the 1990s through today confirm that the poor (overwhelmingly minority) residents of central cities have suffered an increase in the income gap during the last business cycle (some ups, but mostly downs). Poor people became poorer during the 1990s, and the trend has been continuing.
The stats you cite, "median income" and "African-American poverty rate", are blended across the entire constituent population, and they leave out the details of the most distressed. This is the real problem with poverty: people just keep getting left out. The last business cycle tended to be good for the economy at-large, but had either no effect or a worsening effect on the most distressed central-city communities in the country.
I actually do believe both Clintons care, and their track record is pretty good for children and middle-class minorities, but not good for central-cities, where significant impoverished minority populations live.
Sorry for being off-topic, and a little nuanced, but I just don't think these problems get solved with broad strokes. That is also why I particularly honor Barack's community organizing in Chicago.
(and sorry if I was a bit hyperbolic in parts of my previous post. I am guilty of painting with a broad brush at times too.)