Isn't this the way the model essentially works out in our system? There is a small "working class" at the bottom, then a giant bump in the middle for the middle class, and a tiny spot at the top for the 1% of wealthy -- wealthy, not merely rich -- individuals.
I wouldn't simply try to brush off poverty, as surely every effort must be made to ensure social mobility among the classes (both up and down), but in a country as large as America having 45 or so million poor people isn't only to be expected, but actually relatively necessary for our economic model -- which, on the whole, works quite well for most people.