Holy collusion!

Count it as very welcome news that New York’s attorney general is playing Robin to Special Counsel Robert Mueller’s Batman probing into connections between Trump associates and Russia. The development will no doubt prompt foes of Mueller to shriek, even louder than they already have, that partisan politics are at play.

Never mind the caterwauling; this is all about going, necessarily, where the evidence leads.

Eric Schneiderman, who has jurisdiction over Trump’s home state, has reportedly been digging into allegations of shady real-estate deals by Paul Manafort, the ex-campaign boss with tight-as-atick ties to Vladimir Putin allies in Ukraine, and holdings in Trump Tower and the Hamptons.

He does so using New York’s Martin Act, with broad powers to untangle complicated finances.

There’s no telling where shining federal and state spotlights on Manafort’s money trail may lead, but it’s incumbent on the duo to see.

Just as the right sees conspiracies, so too does the left. Speculation swirls that the Schneiderman-Mueller alliance can prevent an upending of the Russia investigation either by Trump firing Mueller or prematurely pardoning key figures.

Nonsense. Federal and state officials cooperate all the time. It’s how justice gets done.