The rumor is he'll be campaigning for mayor of Chicago by Monday:

White House Chief of Staff Rahm Emanuel is expected to announce Friday that he is leaving to run for mayor of Chicago, said two people familiar with his plans.

The two spoke on condition of anonymity so as not to preempt Emanuel.

Emanuel, a former congressman from Chicago, is looking to replace long-time Mayor Richard Daley, who announced his retirement earlier this month.

Obama advisor and former Daschle advisor Pete Rouse will be acting Chief of Staff when Rahm leaves, and may get the job permanently.

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