Mayor Rahm Emanuel weighed in Friday on the raids that threaten the political future of Chicago’s most powerful alderman, but acknowledged that he had many more questions than answers. The deadline to lodge an objection against the petitions filed by candidates running in the Feb. 26 municipal election looms at 5 p.m. Monday, and State Rep. Melissa Conyears-Ervin launched her campaign for city treasurer with the backing of five aldermen — plus her husband, 28th Ward Ald. Jason Ervin.