That's so true.
Goldwater was an Episcopalian.
Christ did not preach for his followers to get involved in Roman politics, nor any kind of politics. I'm aware as you probably are too, of Romans 13:1-7. It's one of the most puzzling passages in the NT for me. Read literally, the Colonists were wrong to declare independence from Britain. But, I don't believe they were.
I believe Christians can serve in governments, but should not use government to decide whose religious beliefs should prevail, because, as Goldwater said, compromise is required in a republican form of government. Otherwise, a group that believes IT speaks for God and won't compromise turns a republican form of government into a theocracy.
Theocracies are notorious for denying The People their rights to life, liberty, and the pursuit of happiness. They are to be avoided, and every one of our Founders would concur.