But Gingrich seems to have noticed that the key to his South Carolina landslide last weekend was overwhelming support from blue-collar and middle-class Republican voters. With those making between $30,000 and $50,000 a year, Gingrich crushed Romney by 20 points. With those making between $50,000 and $70,000, the margin was 16. But at the top end of the scale, it was a completely different story: Romney won by 15 points with voters making more than $200,000.
As I noted the other day, this same basic dynamic was evident in New Hampshire and Iowa, where exit polls found a direct relationship between enthusiasm for Romney and income level.