California’s fair-elections commission is investigating a complaint against the Mormon Church’s role in campaigning for Proposition 8, which made marriage illegal between people of the same sex. Based on the facts that have come out so far, the state is right to look into whether the church broke state laws by failing to report campaign-related expenditures.

Proposition 8, which California voters passed on Nov. 4, overturned a ruling by the California Supreme Court and wrote discrimination against one particular group of people into the State Constitution. After it passed, tens of thousands of people rallied in cities across the country in support of same-sex marriage. The California Supreme Court said recently that it would review whether Proposition 8 was constitutional.

Mormons were a major force behind the ballot measure. Individual church members contributed millions of dollars and acted as campaign foot soldiers. The church itself also played an unusually large role. Michael R. Otterson, the managing director of public affairs for the Church of Jesus Christ of Latter-day Saints  the full name of the Mormons’ church  said that while the church speaks out on other issues, like abortion, “we don’t get involved to the degree we did on this.”

Fred Karger, the founder of a group called Californians Against Hate, who filed the complaint, contends that the Mormon Church provided significant contributions to the pro-Proposition 8 campaign that it did not report, as state law requires. The Fair Political Practices Commission of California is investigating, among other things, commercials, out-of-state phone banks and a Web site sponsored by the church.