Support for gay marriage in California has hit a new high as the Supreme Court prepares to deliberate on the state's ban.

According to a Public Policy Institute of California (PPIC) survey of 1,704 adults conducted between May 14-20, 56 percent of respondents support marriage equality, while 38 percent remain opposed.

“The more that there's been acceptable and legal change in other states, the more Californians have been accepting, especially among some of those groups that were strongly opposed,” Mark Baldassare, president of PPIC, told Bloomberg.

A majority of Democrats (63%) and independents (61%) support gay nuptials, while Republicans remain opposed by a 49-46 margin. However, support among Republicans has doubled since October 2008 (from 23% to 46%).

Blacks continue to trail other minority groups in terms of support. Among Blacks, Asians, Latinos and whites, only a majority (52%) of Blacks are opposed.

A majority of people under 55 also are in support. People 55 and older are split with 45 percent in favor and 46 percent opposed.

In 2008, voters approved Proposition 8, an amendment to the California Constitution which defines marriage as a heterosexual union. Passage put an end to the gay weddings taking place in the state since its highest court legalized such unions. Sometime in June, the Supreme Court is expected to rule in a case challenging the constitutionality of Proposition 8.