A Four-Party Congress?

This gives you some idea of what it would look like.  I'm not entirely sure that it would be a bad idea; the combination of diluted party power and deal-making might actually accelerate the process, and led to some progress, which would be better than the current stalemate.  But, on the whole, I still think it's better for Democrats to just be Democrats, and trust in the common sense of the voters (so long as they're allowed to vote).