New York City Mayor Bill de Blasio will endorse Bernie Sanders for president — a move intended to advance his own elusive quest for national relevance while underscoring his background as a left-leaning, establishment-wary Democrat, according to people familiar with the mayor’s plans.

In backing Sanders, de Blasio is embracing the left wing of the party in its battle with moderates like Pete Buttigieg and Mike Bloomberg, whose outsized campaign spending has vaulted him to the top tier in the crowded primary field.

And as the mayor of the nation’s largest city, de Blasio is one of the highest-ranking politicians to embrace Sanders’ unapologetically liberal White House bid.

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