Bernie Sanders was the obvious presidential choice for all of labor in November’s election. He was a candidate custom-made for the movement, and he handed himself to labor’s leaders ready to wear, running as a Democrat rather than an independent.

Unlike Hillary Clinton, a one-time member of the Walmart board of directors, Sanders has been a lifelong friend of labor with the record to prove it. It was Sanders who represented the left wing of the possible, not Clinton. Moreover, a Sanders presidency was certainly possible — especially at the early stage at which the American Federation of Teachers leadership made its peremptory and undemocratic endorsement of Clinton.

Labor officials such as AFT President Randi Weingarten — who defends her and her union’s endorsement in a recent article called “Why Hillary Clinton Deserved Labor’s Support,” coauthored with Leo Casey, executive director of the Albert Shanker Institute — as well as many others, in refusing to endorse Bernie Sanders while grossly exaggerating Hillary’s viability and worthiness for top office, share responsibility for the Trump victory.