I mentioned this in dissing on the Tea Party earlier, but the Colorado Senate race was one of the most exciting ones for me, because I like Michael Bennet and despise Ken Buck. Bennet, the Democrat, won by a 47.5-47 margin. A Green Party candidate got 3% and I remember thinking on election night, please don't let us get Nadered on this one!
I'd encourage any Democrats looking for something to feel good about to take a look at the wikipedia pages on Bennet and Buck's past careers and views on issues. It's really good that the capable smart public servant beat the angry misogynist.