re: Who are the Democrats in 2004?
Considering that most of those are hovering around a third identifying themselves as Democrats, I'm not sure what the issue is. I would expect at least that high a level by sheer statistical randomness in any group.
In fact, most of these are kind of a surprise insofar as how low the numbers are. I would have thought some groups would be at least 50-50, considering recent polls and election outcomes. Why? Are a lot of people who vote Democrat unwilling to identify themselves as such? Is it something else? The answer to that would be the real story.