I’m not a big fan of political labels. They invite people to put you in a box, and the only box I want to be in is one labeled “open-minded.” I don’t think anyone has a monopoly on the truth.But anyone who takes a look at my résumé — I worked at a top Democratic Party-aligned think tank and a left-leaning political action committee, where I helped Elizabeth Warren and other Democrats win elections — would acknowledge that over the years, I’ve spent a lot of time in the progressive movement.And yet, for the past week, the politician I find...