Supporters of the same-sex marriage measure aren't sure if they have enough votes to pass the bill, but the legislation is also being stalled by the timing. According to the Chicago Sun-Times:
"SPRINGFIELD — The battle to legalize same-sex marriage in Illinois will reignite soon in the Illinois House, but neither side of the issue is predicting the votes yet exist to pass it despite forward movement on a national level.
Both sides of the hot-button issue plan to send bus loads of followers to Springfield on successive days when the General Assembly’s six-day fall session opens Oct. 22. But for now, the push to make Illinois the 14th state to permit same-sex marriage may have the political calendar as its largest obstacle.
State Rep. Greg Harris (D-Chicago), the measure’s chief House sponsor, said he has gained support since May, when he lacked the necessary 60 House votes to pass it and opted against seeking a roll call. But Harris wouldn’t divulge his current headcount or say when he will press for a vote.
“I’ve really not talked about schedules or roll calls in the past, but I think it needs to get done soon,” Harris said."