It's perfectly fine for a church to talk politics from the pulpit as long as they're incorporated as a 501©4 instead of a 501©3, just like any other nonprofit that engages in partisan politics. The deal is that a nonprofit doesn't have to pay taxes if it stays out of politics. If it's so important to preach politics from the pulpit, it should be worth it to pay a little more in taxes to do it legally.
I'm not anti-Christian. I'm anti-stupid.