The letter has more than 300 signatures, and says allowing committed same-sex couples to marry is “morally just.”
They say the bill would not require any church, mosque or synagogue to marry same-sex couples if it disagrees with the practice.
A coalition of black ministers has strongly opposed gay marriage, including with robocalls asking people to urge their lawmakers to vote against it.
A lawsuit challenging Illinois’ ban on gay marriage is pending in state court.
This material may not be published, broadcast, rewritten, or redistributed.