February 20, 2015 5:25 pm Five to Know: William Dock Walls Four candidates are vying to defeat incumbent Rahm Emanuel to become Chicago’s next mayor. Our political reporter Carol Marin continues her “Five to Know” profiles with candidate William Dock Walls. Local 2:16 Chicago City Council weighing a change to speed limits on city streets 2:18 Illinois lawmakers debate possible removal of state's grocery tax 2:03 Colleagues criticize Chicago alderman for speaking near charred American flag 2:27 Chicago Ald. Byron Sigcho-Lopez faces possible censure after appearing at rally with burnt American flag 3:23 As ballot counting continues, recount looms as possibility in State's Attorney's race