The Supreme Court has begun hearing arguments Tuesday on California's Proposition 8, the 2008 voter approved initiative that amended the state's constitution to ban same-sex marriage.
Wednesday, the nine justices will hear a case challenging the Defense of Marriage Act, which denies federal benefits to same sex couples who are legally married in their states.
The latest polls show the majority of Americans, 58 percent, believe same-sex couples should be allowed to wed.
"It's very exciting to see what really is a wave of big mo. It's momentum in our favor. How much that influences people on the Supreme court, we don't know," said George Zander, a regional field manager for Equality California.
The Supreme Court is expected to rule on the cases in late June.