I was also wondering why Darrell Castle wasn't on this poll. He has just as much of a chance as the Libertarian and the Green Party candidates. (which is admittedly a very small chance)
Every time I see a study like this, I reverse the premise and see if it makes sense. In this case, I would ask this. Instead of poverty cause low brain development, does low brain development cause poverty. I would argue that much of IQ is inherited, either through nature or nurture. To put it bluntly, stupid parents tend to have stupid kids. Its also clear that a lower IQ very much limits your earning potential - thus puts your family in poverty.
So, I think this study is balogne. All it says is poor people tend to be on the lower end of the IQ scale, and so are their kids.
Now this is different in that it didn't replace his heart, but its a continuous pump, and results in no pulse.