Lucas O'Conner nails it.
This boils down to the collision of principle vs pragmatism: Whether aspiring to the supposed ideal of post-partisan governance trumps the pragmatism of trying to actually enact beneficial policy. The trick is, the policy is the principle. It can be easy to lose sight of the actual point of politics, but ultimately the goal is to improve people’s lives. And the mechanism is policy. Everything else is the sausage-making. Aspire to as much righteousness as you want in the process of making that sausage, but at the end of the day all that matters is what gets made.
Here is the post.