I mean this in the most respectful way, even though I didn't vote for Obama.... I think many Democrats are very creative people. And because of that creativity, they often have jobs that allow them to work from home or other non-traditional situations. Thus, they have more time to DIS.
Of course, I also think, because they are so creative that they are often more caught up in ideals vs. reality and that also leads them to vote for Obama/Dems.