I think all the airing of theories here on DKos is a great concept and I've enjoyed it all. There are a lot of useful theories.
But I think what should be done is this - Democrats should stop worrying about getting A majority and figuring out how to get TO a majority.
Instead, Democrats should go back to the drawing board and decide what their VISION is and their CORE VALUES are and then start thinking about how to sell that position to the majority.
In other words, Democrats should not be thinking...if we can get take this position on this issue and this position on that issue, we can get to 50.5%. We should be thinking about what our core values and beliefs are and how we can convince the country that those core values and beliefs are worth putting Democrats in office.
Let's have our vision move the electorate, not have the electorate move our vision. Otherwise, we'll alway be chasing those last votes, sacrificing more and more to get them.
(I do admit that for a vision, I like the "Party of Responsibility" theme expressed by Saletan at Slate)