Tomorrow, predicted Stephen Bomse on Thursday, “a lot of people will be getting over a fairly massive hangover.”

The Heller Ehrman antitrust partner was referring to the immediate outcome of the California Supreme Court’s decision Thursday to strike down the state’s ban on same-sex marriage. The law firm signed up in 2004 to provide pro bono advice to a coalition of gay rights and civil liberties groups looking to strike down the law. (Bomse stresses he wasn’t the only lawyer involved. Shannon Minter of the National Center for Lesbian Rights argued for gay couples before the state Supreme Court, while Assistant Attorney General Christopher Krueger defended the law for the state.) We caught up with Bomse to find out about the firm’s work on the litigation and what the court’s ruling means.