Not something you would expect to see. Those red dots correspond to recipients of agricultural farm subsidies – in Manhattan of all places.
The larger red blobs mark people receiving more than a quarter of a million dollars in farm subsidies annually.
The farm bill passed by House Democrats in July would continue giving millionaires farm subsidies (setting the income threshold for payments at $1 million a year, and keeping loopholes in place that allow some making much more to qualify). The Bush administration has proposed sharply reducing the income threshold to $200,000 a year and ending many of those loopholes. That would reduce the number of subsidy recipients by less than 40,000 (of the current million or so recipients)—though I suppose it might put some rooftop gardens on Park Avenue out of commission.