Conservative critics like to point out that the federal appeals court that just declared California's same-sex marriage ban to be unconstitutional has its decisions overturned by the U.S. Supreme Court more often than other judicial circuits, a record that could prove predictive if the high court agrees to review the gay marriage case on appeal.

Yet legal experts seemed to think the panel of the San Francisco-based 9th U.S. Circuit of Appeals struck down the voter-approved ban on Tuesday purposefully served up its 2-1 opinion in a narrow way and seasoned it with established holdings so the Supreme Court would be less tempted to bite.

The appeals court not only limited the scope of its decision to California, even though the 9th Circuit also has jurisdiction in eight other western states, but relied on the Supreme Court's own 1996 decision overturning a Colorado measure that outlawed discrimination protections for gay people to argue that the voter-approved Proposition 8 violated the civil rights of gay and lesbian Californians.

That approach makes it much less likely the high court would find it necessary to step in, as it might have if the 9th Circuit panel had concluded that any state laws or amendments limiting marriage to a man and a woman run afoul of the U.S. Constitution's promise of equal treatment, several analysts said.