Even Obamacare’s main defenders are starting to look in the right places for real health care reform. Ezra Klein has a great column diagnosing what the single payer pivot gets wrong about insurance, in which he notes that it’s not the diversity of insurers per se that cause high costs in the United States. Most European countries with more nationalized health care systems, after all, don’t have just one payer. Rather, it’s that, relative to health care providers, insurance companies are too weak in the the U.S. system.