WASHINGTON — Bernie Sanders publicly shuns political action committees, but a super PAC supporting the Democratic socialist has pumped hundreds of thousands of dollars to boost his White House bid, records released Sunday show.

The National Nurses United for Patient Protection super PAC raised more than $2.3 million last year to help elect Sanders for president, according to Federal Election Commission filings. The PAC, which can raise unlimited amounts of money, is affiliated the National Nurses United union, an active Sanders’ supporter.

The behind-the-scenes financial effort to boost Sanders belies the candidate’s campaign rhetoric against Super PACs.

“Secretary Clinton yesterday just announced, I suppose with pride, that her super PAC brought in $45 million,” Sanders said on NBC’s “Meet the Press” Sunday. “I don’t have a super PAC. Our average contribution is 27 bucks.”

But records show all of the PAC’s spending last year on elections was targeted exclusively on helping Sanders. In all, the PAC reported more than $918,000 to boost to Sanders’ with printing, mailing, advertising and bus tour expenses. The PAC made two separate contributions to Sanders’ supportive groups: $245,000 to Progressive Kick and $150,000 to Reclaim Chicago.

Super PACs can raise unlimited funds from donors and funnel that money into a specific candidate, as long it doesn’t coordinate directly with the campaign on spending strategies. The Sanders-affiliated PAC is funded exclusively by the nurses’ union, records reviewed by The Post show.

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Midnight Sunday was the deadline for candidates and PACs to disclose their fundraising and spending.

A Super PAC supporting Marco Rubio netted $14.4 million in the last half of 2015, putting its total for 2015 at more than $30 million. The Conservative Solutions PAC has nearly $14 million leftover to spend on the Florida senator.

Records also show the Ben Carson affiliated super PAC burned through almost all of its cash in 2015. The 2016 Committee PAC raised nearly $10 million in 2015, but spent $9.4 million. It has just $560,000 left in the bank to help the former neurosurgeon.

Priorities USA Action, the pro Clinton Super PAC, previously announced it has nearly $45 million in cash on hand help the former Secretary of State.