The A/N forum seems to be pretty left leaning place, and includes a lot of people that are to the left of the Democratic Party. Personally, I vote Democrat because it's better than the alternative. I used to be opposed to voting for the lesser of two evils, and even did some leg work for the Nader campaign in my neighborhood until I realized how futile it all was.
My question for you is this.
If you vote Democrat, why?
If you vote for a third party, why?
Is ideological purity more important than tangible political results?