And while we're on the subject of statistics, I may as well go ahead and ask about yours: where did you get that figure from? Because I found something much different:
http://www.census.gov/newsroom/releases/archives/income_weal...
According to this, only about 25% of people living in poverty were white, and that includes the somewhat dubious category 'white, not hispanic.' (It's near the bottom, Table B)
That also includes white retirees, which inflates the figure as you're taking the number of retirees from a large category and sticking them into a smaller category, which means they will be over-represented in the smaller category.
And that's not even mentioning the rate of poverty or welfare participation, which is where the common perception that blacks and latinos abuse the welfare system comes from in the first place. It's much higher than it is or other races. When you dig into the data, it usually turns out that stereotypes exist for a reason, and this appears to be no exception.