A bombshell from City Hall: Mayor Rahm Emanuel will not seek re-election. We unpack what it means, and why is he doing it. And: a report card from the mayor’s supporters and critics.

• Mayor Emanuel Won’t Run for Re-election. What That Means for Candidates.
• Emanuel Stuns Chicago, Rocks Mayor’s Race
• Emanuel’s Aldermanic Friends, Foes React to Bombshell Announcement
• Community Reaction to Mayor Emanuel’s Announcement