If you are in the US, there are legal boundries around what can be taught from the pulpit (tax laws).
A priest cannot get up and say “vote for Joe Smith” or “do not vote for Henry Jones”. If the priest does that, you would be wise to speak to someone at the Diocese.
The priest may speak about moral issues. In our world today, we sometimes forget that our Catholic faith, our moral laws, defy politics. We are called to reject the death penalty, we are called to welcome the stranger, we are called to respect the dignity of every person from conception until natural death.
These teachings can sometimes clash with our deeply held political beliefs and it can be hard to hear them.
If the talk is about moral issues, I would suggest making notes then looking these teachings up.
A couple of great resources are the Compendium of the Social Doctrine of the Church, available on the Vatican website
http://www.vatican.va/roman_curia/p...peace_doc_20060526_compendio-dott-soc_en.html
The Catechism, this is a place where you can search by word
http://www.scborromeo.org/ccc.htm
The USCCB for those of us in the US, or your local Bishops Conference website.