The proponents of the gay marriage law have complained to the IRS that the Catholic Diocese of Maine is violating tax rules by helping a referendum campaign that would repeal the state's new same-sex marriage law. The Empowering Spirits Foundation said its challenge was filed Wednesday at an Internal Revenue Service office in Dallas. The San Diego-based group said the diocese is engaging in political activity by collecting signatures for the referendum, violating IRS rules applying to nonprofits.