While I sympathize with preachers who want to exert their freedom from government intrusion, I think the idea of endorsing candidates from the pulpit is beneath the dignity of God's House. I live in a small town and I've lived here a while now. My parishioners who care to know certainly do know about my political leanings. But not from listening to my sermons. Indeed, I think it's important for preachers to make the disclaimer "not the Lord, but I say" whenever they discuss politics with layfolks, even just over a cup of coffee at the local greasy spoon.
But then again, part of my political leaning is that I don't put much stock in elections...so I may be biased.