Racist Southerner who ancestrally voted Democrat up until Kerry but hates Obama as a black Muslim and McCain as a RINO and writes in good Southern conservative George W. Bush in 2008 as a protest vote
So the voter that pined for a "good Southern conservative like George W. Bush" voted against him in 2004 in favor of John Kerry? LOL, okay.
I'd say the group with the biggest swing would be people who are now likely dead: older Dixiecrats who refused to ever vote Republican until the Democratic Party did, in fact, nominate a Black candidate - the folks who were slowly replaced by the Newt Gingrich generation that was a lot less sympathetic to fiscal populism that had won in the South throughout the '60s, '70s and '80s.