On behalf of nine Illinois couples seeking recognition for their shared love and commitment, the American Civil Liberties Union and the ACLU of Illinois have filed a lawsuit to challenge the constitutionality of Illinois' law that denies gay and lesbian couples the freedom to marry. Currently, Illinois law excludes gay and lesbian couples from the recognition and protections that come with the universally recognized relationship status of marriage, and limits them instead to a separate civil union status.
https://www.aclu-il.org/en/cases/lazaro-and-matos-v-orr