A year after backing consummate insider Rep. Joe Crowley’s re-election, the Working Families Party is looking to raise cash by “defending” his vanquisher, Rep. Alexandria Ocasio-Cortez.

Just hours after Bronx Councilman Fernando Cabrera announced he’d challenge her in the Democratic primary, the WFP started emailing for donations … that it vowed to split with AOC.

The WFP calls Cabrera, a solid progressive who doesn’t happen to think it makes sense to chase away job creators like Amazon, “a right-wing, red-baiting Democrat.”

Yes, the party jumped on the AOC bandwagon the instant she beat Crowley. Then again, on the presidential front, it has dropped Bernie Sanders in favor of Elizabeth Warren … who happens to be far more comfortable with the Democratic establishment.

For all its progressive posturing, the Working Families Party has always been a conglomeration of special interests (public-sector unions and government-supported outfits like ACORN and its successors), run by hacks who sell a fine-sounding ballot line.

For years, it backed the odious Brooklyn Democrat Vito Lopez. In 2005, its endorsement of Republican state Sen. Nick Spano was vital to his defeat of now-Senate Majority Leader Andrea Stewart-Cousins.

Candidates, beware: When the WFP vows to have your back, the pledge is only good while the wind is blowing your direction.