I do not know, and do not really care, if Mormons are considered Christians. That being said, here is a link to Romney's speech earlier today.
Here is a phrase from that speech that scares me
"Freedom requires religion just as religion requires freedom. Freedom opens the windows of the soul so that man can discover his most profound beliefs and commune with God. Freedom and religion endure together, or perish alone.
Some folks may desire freedom from religion. Some folks may practice a religion other than what the majority practice and would like to be left alone to practice it without being made to feel inferior.
I believe a strong and tall wall between civil government and any & all religious practices is the best way to protect all beliefs.
Update I: The Left Coaster has some more cogent and interesting quotes and comments.