Albeit in a small population county in California, I was a county elected official.  Although my platform was my own, it conformed nicely to the Catholic Bishops 1986, Social and Economic Justice.  At the time, I didn't feel it necessary to mention I was a weekly Mass attendee, only that I was a member of the music group at my parish.  So whether a politician speaks at churches or not is, in my opinion, irrelevant.  What is their platform?  What do they speak about the most?  Does it conform to the highest ideals of whatever faith we have?  That is what is important.