It doesn't matter if you think it means the voters were to the right of Coakley (and sincerely voted for Brown) or to the left (and voted for Brown to act like spiteful jerks). It doesn't matter because no matter what the situation is now,
your job is still to gain consensus amongst the voters for what you want. The Democrats - if they are to survive - will always try to represent the left half of the population, no matter how right the median opinion is. If you punish them from the left for that, why wouldn't they try to make up for it by lurching a bit further right? Especially when you give them no specific terms for your vote -what's to say that you still won't give them your vote should they give you this or that? Even if you think that that's evil or wrong, they can still get away with it.
But shift the populace leftward and they'll have no choice bit to follow, because you'll win the primaries, and the general.
But you have to make sure you can do that. You have to do the work.
You won't even have to argue on DU about what you think the party should do. You'll be making it happen. Or you can continue to make excuses for not letting it happen, and leave it in the hands of other people, who you'll complain about year after year.
Is it any wonder why princes and kings
Are clowns that caper in their sawdust rings?
Ordinary people that are like you and me
We're the keepers of their destiny.- Oasis, "Go Let It Out"
http://www.youtube.com/watch?v=p_uWYnrDsa0