As Catholics, we are called to bring the faith into the public square.
Sunday is a day which replaced the Jewish Sabbath as a day of worship and thanksgiving to God. In the Catholic Church, I don’t think there’s much time to get into politics on a Sunday morning, but the Church does issue statements on political issues (careful to maintain its tax-exempt status) at other times.
I have seen Catholics who have political ambitions take highly visible roles in church to get some name recognition come election day. The Church sponsors and/or participates in the Right to Life marches in Wash DC for example.
Some churches may be small enough that nobody is going to turn the pastor in to the local prosecutor for giving a sermon on a political topic.
In my town, known for all its churches and bars, there are very few if any pastors who show up for public council meetings. They may work more quietly behind the scenes.
If you’re not Catholic, why don’t you give us a chance to show you the splendor of truth entrusted to the Catholic Church?