Not that the Romney folks want my advice, but I offered it here. Above all, he shouldn’t say what Kennedy said, which emphasizes no-aid separationism above all else, raises the secularist boogeyman of churches and denominations ordering people around, and looks forward to a time when religious distinctiveness will diminish to a point of insignificance. Some pundits will treat this as Romney’s template, but it wouldn’t work for at least two reasons. First, its no-aid separationism is much more appealing to secularists and liberal Baptists than to anyone else. And second, if he’s going to honor the role that faith plays in the lives of Americans (which I think he has to, given his immediate audience), he can’t be as hostile to the "prophetic" role of denominations as JFK was.
It will be interesting to see what he says.