The sponsors of the resolution are Mayor Lee Leffingwell, center, Mayor Pro Tem Sheryl Cole, far left, and Councilwoman Laura Morrison, third from left.

The Austin City Council is scheduled to vote Thursday on a resolution in support of marriage equality.

Sources tell us the resolution is all but certain to pass, making Austin the first city in the state to formally back marriage equality.

More than 1,700 people signed a petition in support of the resolution posted by Equality Texas last month.

The resolution is sponsored by Mayor Lee Leffingwell, Mayor Pro Tem Sheryl Cole and Councilwoman Laura Morrison. It is backed by Equality  Texas, the Human Rights Campaign, the Anti-Defamation League, the NAACP, and the Mexican American Legal Defense and Education Fund.

Leffingwell, Cole and Morrison will join representatives from the groups for a press conference at 9:30 a.m. Thursday at City Hall.

“The Council resolution recognizes that marriage is a powerful and important affirmation of love and commitment and a source of social support and recognition,” Equality Texas said in a release today. “Passage of this resolution will send the message to state and national leaders that Austin is a community that values equality for all its citizens. The resolution will also send the message that the City of Austin believes all couples in loving and committed relationships should be given the opportunity to create stronger and more successful families through civil marriage.”

Read the resolution after the jump.

Austin Resolution