Mr Obama's supporters are, mostly, the liberal version of “values voters”. They are intensely worried about America's past sins and its current woeful image in the world. They regard Mr Obama as a “transformational” leader—a man who can, with one sweep of his hand, wipe away the sins of the Bush years and summon up the best in their country.
Mrs Clinton's supporters, by contrast, are kitchen-table voters. They wear jackets emblazoned with the logos of their unions. They work with their hands or stand on their feet all day. They have seen their living standards stagnate for years, and they are worried about paying their bills rather than saving their political souls.
Obamaworld versus Hillaryland
http://www.economist.com/world/na/displaystory.cfm?story_id=10808693