Forgive my ingorance, but what is Mayor Daley's political stance?
Mayor Daley is usually strongly aligned with the left-wing in this country, and the left wing thinks they can tell him what to do.
I'm honestly not sure about his political position on gay marriage -- I assume he's in favor. He's in favor of every other part of the so-called gay-rights agenda. (His father would be shocked and stunned at all this.)
Maybe someone who knows more will comment here -- it's been a few years since I've lived in Chicago.
I bet the left wing would also like Mayor Daley to use this meeting to criticize Polish involvement in Iraq -- the left wing in this country is just livid about the liberations of Iraq.