The issue surrounding the ruling is whether Judge Walker should have disclosed his openly-gay relationship of 10 years before ruling on the same-sex marriage ban.
Most legal scholars agree that his sexual orientation is not an issue, but the fact that he didn't disclose his long-term gay relationship before the trial could be.
The motion to vacate Judge Walker's ruling is brought by supporters of Proposition 8, a state initiative that sought to define marriage as a union between one man and one woman.
Supporters of same-sex marriage plan to demonstrate outside the federal courthouse before tomorrow's hearing.
