One does not have to use the word supremacy in order to convey the same meaning. The statement "make sure Christians are the head and not the tail, and the top and not the bottom, of our political system" certainly connotes maintaining Christian supremacy. And, no doubt, it is their version of Christianity that they want to see at the top.

@Joanne "One does not have to use the word supremacy in order to convey the same meaning"

I think one does if one subscribes (I do) to "I say what I mean and mean what I say" (I don't think that makes me a mean person).

"At the top of our political system " could refer to the top religion, not political supremacy -- what religion doesn't want that.

@FearlessFly . Yet, Christianity has had a special place in this country- not any other religion. The separation of Church and State the founders wanted has been greatly ignored. These Christians are not saying they want to remain the dominate religion in this country. They are saying they want political power, and to be at the "top" of that system. And, they have shown that they want to use the government to ensure their place at the top--their supremacy.