While these protesters are the good guys and Cardinal Mahoney ought to be ashamed of himself, I don't think there is or shoudl be a constitutional right to disrupt religious services. I'm thinking Rainbow Sash, ACT-UP or Voice of the Faithful here. I think demonstrations of any kind should be required to take place outside of the Church building.
The church may be desecrated by this apostate priest and killer of the unborn but no protests. Nooooooooooooo.