AP: Rahm to Resign on Friday

President Obama’s chief of staff Rahm Emanuel will resign from his post tomorrow and begin campaigning to be mayor of Chicago on Monday, the Associated Press reprorts, citing two people close to Emanuel.

The move would be no surprise, and should set off a wave of speculation about his potential replacement. The question is whether Obama will choose somebody further to the left, to assauge the concerns of liberals who perceive the Obama administration as too moderate, in no small part due to the influence of Emanuel.