What Are "Sunbelt Cowboys" and "Established Yankees

What are "sunbelt cowboys" and "established Yankees"?

A) labels for a regional division between conservative and liberal elites in the South and North, respectively
B) Blue Dog Democrats and Reagan Democrats
C) self-made millionaire conservatives and liberals from old-money backgrounds
D) a North-South divide not strictly along liberal-conservative lines (e.g. George W. Bush's origins in Connecticut and Bill Clinton's in Arkansas)