The unions attacking a former Obama official? Someone pinch me, I must be dreaming.

Chicago — The president of a labor union is in the center of the latest controversy in the mayor’s race, specifically what he said at a campaign event for candidate Gery Chico. Jim Sweeney, of the Operating Engineers Union, called Rahm Emanuel a “Wall Street Judas” for his support of NAFTA in the 1990s.

Emanuel addressed the controversy during a campaign stop Wednesday.

“We all know the history of that comment, and we know the history of that reference. Which is why I have absolute confidence in the people of the City of Chicago and what they’ll see it for and they will not accept it or any of the connotations or the values behind it,” Emanuel said.

Chico’s campaign said he has three Jewish children and that it never occurred to him that the comment was anti-Semitic.

Sweeney also rejected any suggestion that the comment was anti-Semitic.