Representatives Greg Harris, Deb Mell and Kelly Cassidy on Wednesday introduced a gay marriage bill in the Illinois General Assembly, Chicago gay weekly Windy City Times reported.

Harris was the primary sponsor of legislation last year that created civil unions for gay and lesbian couples.

The move comes a day after a federal court ruled unconstitutional California's gay marriage ban, Proposition 8, and on the day the Washington House approved a gay marriage bill and sent it to Governor Chris Gregoire for her signature. Gregoire has said she looks forward to signing the bill into law.

Citing increasing support for marriage equality, Harris told the AP that Illinois could become the next state to legalize marriage for gay couples.

“The numbers all tell the same story – that in the last year, for the first time, the majority of Americans believe in full marriage equality,” said Harris.

Illinois Governor Pat Quinn signed last year's civil unions bill into law and is a supporter of marriage equality.

Bernard Cherkasov, CEO of gay rights group Equality Illinois, cheered the news, saying that while civil unions were an important step forward, only marriage could provide true parity.

“Separate is not equal,” he said.