It's a bit of a paradox that Mormons support Romney because as a Mormon he supposedly shares their values and having a Mormon elected as President will be good for their church outreach, but at the same time they tell non-Mormons that Romney's religion should have nothing to do with their vote.
Exactly.
Most Mormons I know who are supporting him are doing so because he shares their values, NOT because they are Mormons. They don’t support Harry Reid, for example, even though he is also a Mormon.
However, it is true that I have not met a Mormon who holds Romney’s faith against him.