One shows counties that voted for Obama (the darker the purple the more Obama votes). Note the lack of Obama votes in the south.
And the other shows median household income (the darker the green the higher the income). Note the extent of poverty in the south.
What you see in the maps is that the poorest parts of the country are mostly in the deep red Republican south.
So guess who doesn't pay taxes while they mooch off the government (to use Romney's sentiment)? Yup.
Simply put: Romneys assessment of an electorate motivated entirely by their relative economic status badly misses the impact that other issues social ones in particular have on the electorate. Assuming that anyone who doesnt pay income taxes must, by necessity, be an Obama voter is a major strategic oversight by Romney that, if not corrected, will cost him the election.