Illinois may give a few token rights to gays, but it won't want to upset the people in the south part of the state.
Illinois is a weird state. The northern half is fairly liberal most of the time, while the southern half is very conservative all the time. As an example, Illinois never had a state law banning interracial marriage, but the entire southern half had local laws that banned it, while the northern half it was completely legal.
My {smallish} home town in northern Illinois currently has 3 gay bars {1 of which opened in 1981}, but the surrounding 3 towns refuse to grant liquor licenses for gay bars.