Every policy change has two components: a partisan and a non-partisan change. Partisan changes are along standard partisan axes, where people are lined up in a tug-o-war on different sides pulling in different directions. Non partisan changes, in contrast, are not seen as a win for one side relative to others…partisan changes can only be good if some parties are right while others are wrong about what is good. In contrast, you can be right about a non-partisan change without others being wrong. Since the total space has a far larger dimension that the partisan space, there is a huge scope for searching in that larger space for changes that all sides could see as good.
The whole piece is worth reading.