I know near zero about Mormonism but it is better that this gets aired now than during the general election. Got a few source links to back you up?
It is Mormon doctrine, take the time to research Mormonism for yourself just do a google. There is plenty of info available.
My mom wrote a book (unpublished) about cults a couple of decades ago, and I remember this as their doctrine. I found some referenced information at http://www.jesus-is-lord.com/cults.htm#mormon
I’d look for direct Mormon information, but I have to get to work! Hope this helps.