Rahm Emanuel already has a new 312 area code and a campaign website that will launch this weekend, sources say.
The Democrat's resignation as the White House Chief of Staff isn't official, but already the Washington, D.C. press corps is in Chicago asking questions about his likely mayoral run.
CNN's White House reporter was seen asking voters questions outside of City Hall and reporters from the Washington Post were seen asking for directions.
President Obama on Friday will make a "personnel announcement" from the White House Rose Garden. That's expected to include official word of Emanuel's resignation and his replacement.
Emanuel is expected to begin his listening tour in Chicago's neighborhoods.
Mayor Richard Daley announced Sept. 7 that he would not seek a seventh term as the city's chief executive.