As far as badmouthing conservatives, there is some merit to it.
http://psychologytoday.com/articles/index.php?term=20061222-000001&page=2"All people are born alike—except Republicans and Democrats," quipped Groucho Marx, and in fact it turns out that personality differences between liberals and conservatives are evident in early childhood. In 1969, Berkeley professors Jack and Jeanne Block embarked on a study of childhood personality, asking nursery school teachers to rate children's temperaments. They weren't even thinking about political orientation.
Twenty years later, they decided to compare the subjects' childhood personalities with their political preferences as adults. They found arresting patterns. As kids, liberals had developed close relationships with peers and were rated by their teachers as self-reliant, energetic, impulsive, and resilient. People who were conservative at age 23 had been described by their teachers as easily victimized, easily offended, indecisive, fearful, rigid, inhibited, and vulnerable at age 3. The reason for the difference, the Blocks hypothesized, was that insecure kids most needed the reassurance of tradition and authority, and they found it in conservative politics.
The most comprehensive review of personality and political orientation to date is a 2003 meta-analysis of 88 prior studies involving 22,000 participants. The researchers—John Jost of NYU, Arie Kruglanski of the University of Maryland, and Jack Glaser and Frank Sulloway of Berkeley—found that conservatives have a greater desire to reach a decision quickly and stick to it, and are higher on conscientiousness, which includes neatness, orderliness, duty, and rule-following. Liberals are higher on openness, which includes intellectual curiosity, excitement-seeking, novelty, creativity for its own sake, and a craving for stimulation like travel, color, art, music, and literature.
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Small towns are very closed, predictable and rigid which are what conservatives need as they need a predictable, reliable external environment to feel internally comfortable. Large cities are unpredictable, open, novel & expansive which attracts liberals.
As far as the new deal coalition, it also consisted of southern rednecks who left the dem party and became republicans in the civil rights movement.
Racial tension plays a huge role in politics. That is why the south was dem for 100 years, because Lincoln and the reconstructionists were republican. then when the democrats supported civil rights they all became republican. At the same time the people rejected by and cast as inferior according to these tensions and by these racial divisions (blacks, latinos, asians) became dems. Alot of voting can be tied into racial tension.