Being in the south and knowing how important church is here, a Mormon can't win below the Mason Dixon. Call me bigoted if you will, but I know the Southern Baptist are a big block of voters here, and won't vote LDS.
How could they vote for Hillary instead?
Expect Dems to play on those reigious bigotries as well. Also expect them to play up the fact that the LDS church is heirarchical and that the church leader claims to be a prophet.
Call me a pessimist, but I don't think a Mormon has a chance of winning the presidency in this country; he'll catch it from both ends: The conservative Christians think Mormonism is satanic, and liberals and moderates are terrified it will be a theocracy.