Ummm.. No, there was no law against it, therefore they had every right to be there. The churches themselves did not get involved in the electoral process, they just spent money on ads, and people. This is something political parties do all the time, despite the fact that they are private entities. Private entities have the right to spend money on whatever they choose, as long as they aren't doing anything illegal. You don't like the fact that the Catholic and LDS church's can spend money in your state on ad campaign's, get the laws changed. But while you are at it, make sure that the Republican National Convention and the Democratic National Convention are also banned from spending money there too. After all, these are all private entities.