In addition, it is simplistic to say that Democratic economic policies will aid southerners, particularly the "poor" ones that Dean speaks about. Maybe the southerners believe that lower taxes and greater economic freedom will lead to better job creation for them than higher taxes coupled with social programs.
It's also worth noting that not everyone votes primarily on economic issues. Michael Barone notes in "The Almanac of American Politics" that social values and depth of religious commitment are a bigger indicator of political preference than income. Bush did poorly with secular voters in '00, but did well with highly observant Catholics and Protestants. But I know that the pattern doesn't always hold true, because Reagan wasn't highly obseranvant yet crushed Southern Baptist Jimmy Carter in 1980. An exception to every rule.
Exactly. The religious right has appealed to conservative rural southerners, but has made the Northeast and other urban areas a Democratic stronghold. As Clinton handily won the '92 election, the top two states in per capita income (CT and NJ) were only won by 6% and 2% respectively. Gore, in a 50-50 race, won them by 16% and 17%.