Michael Blake, a longshot mayoral candidate , has sued New York City’s Campaign Finance Board over not being allowed in the second mayoral debate this week, arguing the board has unfairly denied him a spot on the stage this Thursday.

The CFB said in late May that Blake would not be participating in the debate because he hadn’t met the fundraising thresholds to qualify for it.

But Blake’s campaign argues in the suit, filed Monday in Manhattan Supreme Court that he had, in fact, met the requirements — receiving $255,313 matchable dollars from 1,592 matchable donors — and that it was the CFB’s system errors that mistakenly made it seem that he hadn’t.

“You’re denying him on stage because of your errors? That’s just ridiculous,” Blake told the Daily News.

The candidate, a former Bronx

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