Matt at Left in the West has stated that he is more interested in accountability than he is just in having a Democratic majority. Good for him!
I have often disagreed with Matt on philosophical reasons, but I admire the way that he thinks. Because I am old, I am willing to make a prediction: Matt will soon find out the syllogism that all politicians are human, and all humans are fallible, ergo all politicians are fallible is true. When he does, he will be faced with a choice, surrender to his ideals, and go along to get what he thinks is important, or decry those who failed him.
The true measure of charachter is the ability to remain true to yourself. I hope that Matt does. Who knows, maybe someday he will run for office himself, and I will be forced to seriously consider voting for him.