As a conservartive Lutheran, politics is never mentioned in sermons, it is frowned upon.. They preach the law to show us our sins and need for a Savior and then the Gospel to proclaimed we are saved.. You go to any WELS, LCMS or ELS Lutheran church and this what you will.
That is OK as long as you are the Rev Wright, Rev Al or Rev Jesse. Dims do it all the time.
I bet the Rev. Charles Henrickson can attest to your statement above. The only time I ever heard one of our former LCMS pastors mention anything about politics, was after a golf event and he was not wearing his clerical collar;
His statement was:
I don't know how any Christian can go to church on Sunday and vote for a democrat on Tuesday.
I had that as my tagline for many months.
The question is not whether they discuss politics in their sermons but whether they discuss the Papacy being the antichrist in sermons. My guess is they don't. But certainly without evidence that Bachmann sat there while this was being discussed in sermons I see no reason to hold equivalence between this situation and Obama's.