For the past several months—and the past three Democratic presidential debates—the party’s two progressive standard- bearers, Bernie Sanders and Elizabeth Warren, have been making love, not war. As Warren told Anderson Cooper in the first debate, “Bernie and I have been friends forever.” During the second debate, with both of them on the stage the same night, Warren made a point about the disastrous effects of US trade policy—and Sanders chimed in, saying, “Elizabeth is absolutely right.” When Wyoming Representative Liz Cheney attacked Warren on security policy, Sanders tweeted in the Massachusetts senator’s defense, while Warren has resolutely refused repeated media entreaties to disavow her support for Medicare for All, the Vermont senator’s signature initiative.
This absence of infighting on the left—or at least between these two left candidates, since…