Voters head to the polls Tuesday to decide Chicago's first mayoral runoff since the city changed to a nonpartisan election system. They'll also decide who will represent 18 wards in the City Council, and some incumbents could be thrown out. We analyze the mayoral and aldermanic races with a panel of political experts.Joining us are Chicago Sun-Times reporter Laura Washington, Northwestern University assistant professor Tom Ogorzalek, and Chicago Tribune reporter Bill Ruthhart.

Chicago Tonight's Mayoral Runoff ForumThe New 2: 2nd Ward Aldermanic Runoff ForumSandi Jackson’s Replacement Faces Challenge: 7th Ward Aldermanic Runoff ForumAn Outsider Takes on a Daley in Bridgeport: 11th Ward Aldermanic Runoff ForumRunoff for Foulkes in New Ward: 16th Ward Aldermanic Runoff ForumAld. Lona Lane Faces Stiff Challenge: 18th Ward Aldermanic Runoff ForumA New Voice for 24th Ward: 24th Ward Aldermanic Runoff ForumRough Run in 31: 31st Ward Aldermanic Runoff ForumOpen Seat in a New Ward: 36th Ward Aldermanic Runoff ForumFreshman Alderman Tries to Hang On to Her Seat: 41st Ward Aldermanic Runoff ForumBattle Intensifies in 43rd Ward: 43rd Ward Aldermanic Runoff ForumEmanuel Foe Faces Runoff Rematch: 45th Ward Aldermanic Runoff ForumNeighborhood Issues May Fuel Uptown Race: 46th Ward Aldermanic Runoff Forum

View the latest weekly poll for the mayor’s race conducted by Ogden & Fry.

Chicago voters cast a total of 142,344 unofficial Early Voting ballots through Saturday, April 4, according to the Chicago Board of Elections Commission. Click on a ward in the map below to learn how many Early Voting ballots were cast in that ward.

View the map below to see how many early voting and absentee ballots were cast in each ward.

- Courtesy of Tom Ogorzalek

View the map below to see how the mayoral candidates fared in wards with aldermanic runoffs during the February election.

- Courtesy of Tom Ogorzalek