Bernie Sanders is an anomaly in US politics.

He has demonstrated a constancy of principles for more than forty years, guiding him to work in the interests of working people. Sanders hates personal political opportunism. He faced arrest as a young man, not for a photo op and name recognition, but because he hates injustice and believes in our society’s democratic ideals. Workers losing their homes, their families, their work, their self-esteem, and mistakenly labeling themselves as failures rather than victims of social, economic, and political forces allied against them — Sanders sees these as crimes against the spirit of humanity.

That constancy of moral principles in favor of working people made Sanders the strongest candidate for organized labor in 2016. Yet nearly all the major unions endorsed and supported Hillary Clinton in the 2016 presidential campaign, even though her political record in support of labor was marginal at best.