PORTLAND — Maine’s Roman Catholic Diocese of Portland says a judge’s decision to strike down California’s same-sex marriage ban is “an insult to the millions of California residents” who voted to keep the definition of marriage as between a man and a woman.

Wednesday’s ruling affects only California but gay marriage supporters and opponents from coast to coast are following the case closely.

Portland Diocese spokesman Marc Mutty says he anticipates the California judge’s decision will go to the U.S. Supreme Court after appeals.

The diocese was one of the big backers of a successful referendum to repeal Maine’s gay marriage law. Currently, same-sex couples can legally wed only in Massachusetts, Iowa, Connecticut, Vermont, New Hampshire and Washington, D.C.