Nearly a dozen aldermanic candidates rallied at City Hall Wednesday in an effort to breathe new life into a measure that would put the Chicago Police Department under the control of an elected board of civilians, while former U.S. Rep. Luis Gutierrez backed Ald. Ameya Pawar (47) in the race for treasurer and Toni Preckwinkle released her first ad buy focused on what her campaign said in a statement was her “pivotal role in the Laquan McDonald investigation.”