I'm not a tax attorney, but I do know that the IRS has been investigating the prohibited political activities of not-for-profits.
I certainly hope the IRS will take a look at the home page of the website of the diocese of Fresno that contains a boldfaced directive to vote "yes" on Prop 8.
The IRS prohibits organizations of this type from donating funds to a particular candidate for public office, or, inviting a candidate to speak, but I am not sure about whether or not this "Yes on Prop 8" political directive violates IRS laws. If so, let the Roman Catholic diocese of Fresno start paying taxes. Why raise taxes on the rest of us when church organizations are not playing by the rules?
(In the nearby diocese of Oakland, Bishop Vigneron takes a more subtle approach, talking about the god-willed status of marriage as exclusively a man/woman combo, while not specifically telling his flock how to vote. This is because Allen Vigneron was trained in Rome. He is not holier than the bishop of Fresno, but he is slicker.)
Also, if you go to the home page of the Archdiocese of San Francisco, you will find (as one of a handful of revolving banners) a link to this group. Go there, and you will be asked to donate to "restore marriage and protect children" by voting "yes on Prop 8". Are you as disgusted by this as I am?
Incidentally, these bishops feel they are justified in this political intervention because of a directive from United States Conference of Catholic Bishops. It is called "Forming Consciences for Faithful Citizenship". In this pastoral letter, the Bishop of Fresno summarizes his interpretation of this directive and offers it as justification for his political intervention. The amusing (and disgusting) aspect of his letter is the way he says "Vote your conscience" but be sure your conscience is formed correctly so that you will vote "Yes on Prop 8". Like so many bishops and priests, this one must be convinced that his followers are stupid and that they do not see the torturous gyrations and word games he is spinning out in the name of Jesus.