Sen. Kirsten Gillibrand is a complete poser who’s failed to deliver for New York, so The Post heartily endorses whip-smart GOP moderate Chele Farley for US Senate.

As Farley notes, New York needs senators who are both willing and able to fight for it. Not pols looking to move up in Democratic circles — Hillary Clinton, Chuck Schumer, Gillibrand — or hamstrung by a fixation on resisting President Trump.

All three of those Dems have grossly twisted their political profiles for greater national appeal, often at the expense of New York (and the nation). And Gillibrand has been the worst of the lot.

The daughter of a top political fixer, she was a lawyer for Big Tobacco before entering politics. To win a conservative House district Upstate, she presented herself as a backer of gun rights and a friend to Wall Street. Yet the minute she took Clinton’s Senate seat in 2009, she darted feverishly left.

GovTrack, an independent legislative monitor, ranked her the fifth-most-liberal US senator last year, yet barely in the middle when it comes to “leadership.”

She went all-in on #BelieveAllWomen, even chiding Bill Clinton for his abuses — before later recanting under pressure.

Her support for Israel has rapidly waned: Besides backing the Iran nuke deal, she waffled on bills to target Israel-boycotters and to cut funds to the Palestinian Authority if it keeps rewarding terrorists.

With her eye on a 2020 presidential run, she’s a nonstop Trump opponent, and in no position to push to fund the cross-Hudson train tunnel. Farley, by contrast, could be pivotal in winning federal support for that and other vital projects.

A Wall Street vet with two Stanford engineering degrees, Farley vows to fight to reduce, if not eliminate, the $48 billion difference between what New York sends to DC in taxes and what it gets back in funding. One idea to do that: make rent tax-deductible, like home mortgages.

And she can be trusted on Israel: She openly opposes the Iran deal, for example, and backs Trump’s embassy move and anti-boycott legislation.

New Yorkers who want a senator who’ll fight for them should vote for Chele Farley on Nov. 6.