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Whoa. Even by the lofty standards of public corruption in this town, this one is staggering.

According to a Washington Post story posted a few minutes ago, federal prosecutors this afternoon will be filing charges against Harriette Walters and Diane Gustus, officials in the Office of Tax and Revenue, for embezzling some $14 to $20 million in an elaborate money laundering scheme.

Key line: “Law enforcement sources said the sheer size of the theft will rival any previous D.C. corruption case.”