From WMAQ's Mary Ann Ahern (of NBC's Chicago affiliate) and NBC's Domenico Montanaro
Sources tell NBC News that President and Mrs. Obama have voted and mailed in their absentee ballots in the Chicago mayoral election.
Former White House Chief of Staff Rahm Emanuel is seen as the front runner. He needs get above 50% on Tuesday to avoid a runoff. If no one clears that threshold, there will be an April 5th face off between the top-two vote getters.