Let's be clear that "centrism" is, for the most part, a cosmetic pose for the benefit of Beltways journalists who know that The Most Important Thing Is To Be A Centrist.
In terms of what those centrists actually support in terms of policy, I'd say there are roughly 3 kinds of things. Occasionally they live up to their name and push through genuine compromises between left and right. More often than that they push fake "split the baby" compromises which achieve nothing genuine but have the appearance of doing "something."
And, most often, "centrism" is used as a cover for what amounts to bipartisan endorsement of corruption in the name of furthering the Might and Majesty of the establishment powers.
