President Obama’s re-election campaign is trying to dig up dirt in the Garden State.

Despite New Jersey Gov. Chris Christie’s repeated pronouncements that he will not seek the GOP presidential nomination, Obama operatives are compiling a dossier of what they call “opposition research” — material that could be used to damage Christie if he changes his mind, The Post has learned.

The Obama campaign is trying to keep its efforts from public view, concerned they would only elevate Christie’s already impressive standing within the Republican Party, sources said.

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