Adding liberally to Blaz’s power

THE SPEAKER vote on Wednesday was as much a victory for Mayor de Blasio and the left wing of the City Council as it was for Melissa Mark-Viverito.

Cheerleader-in-chief de Blasio engineered the new speaker’s win by arm-twisting reluctant Council members — and effectively took control of the city’s legislative branch with a unanimous victory that gives him free rein to push forward his ambitious agenda.

The decisive win also showed Democratic county bosses, the traditional kingmakers in the speaker’s race, that he is the one really in charge — and one of his closest allies will be setting the Council agenda.

There’s also cause for champagne popping among the Council’s newly empowered Progressive Caucus, which for the first time in history has one of its own in power.

In one of her first acts as speaker, Mark-Viverito tapped her caucusco-chairman Brad Lander to head the powerful Rules Committee.

That post will give Lander, a Brooklyn Democrat, a key role in picking leaders for Council committees.

The most coveted leadership positions — which often come with lucrative salary bonuses— are almost certain to go to MarkViverito’s allies.

Initiatives that have languished for years, like noncitizen voting and expanding wage mandates, are now likely to be taken up immediately.

Expect big changes in the sharp tilt to the left, said political consultant Hank Sheinkopf.

“We’ve had liberals with a capital L, but this is the most empowered left-leaning Council in history because this Council can get things done,” he said.