After living in a Mormon run state, I'd be very apprehensive about a president that is LDS. I know that it's a lot different since the LDS church would not have control of the U.S. like they do the state of Utah, but if the church has any control of the presidency like the do the gorvernors here, look out. Here they try to legislate LDS church views on those of us who are not LDS. The flip side is the control they have on the gorenment is why Utah is such a nice place to raise a family dispite some of the overt attitudes shown to those not of their faith.
I think that as the campaining goes along more about his religion is going to surface and could cause problems. We'll be watching as time goes on.