Chicago mayoral candidate Rahm Emanuel is offering a reward if the person behind a fake Twitter account poking fun at him comes forward.

Emanuel says he'll donate $2,500 to the charity of choice for the author of @mayoremanuel, a hilarious send up of the former White House chief of staff's campaign travails that comes complete with all the expletives in his arsenal.

The account was set up before Emanuel was kicked off, then reinstated on the Chicago ballot. It has thousands of followers -- more than Emanuel's real Twitter account, according to The Hill, a newspaper that covers Congress.

Emanuel made his offer on WLS radio yesterday -- exactly one week before the Feb. 22 election.