The key difference between Mormons and evangelicals, it seems, is that Latter-day Saints are embracing a different standard when it comes to choosing their candidates.
Maybe the key difference is that Mormons aren’t as flagrantly racist as white evangelical Christians in the United States. I don’t know that much about Mormons, but I do know that evangelical Christians have long used Christianity as a tool to push a racist political agenda. Consider, for instance, that the Southern Baptist Church was founded in 1844 as a pro-slavery Church in response to the Baptist Church forbidding missionaries from owning slaves.
The Christian religious right in America has been embarrassing itself for as long as it has existed. They didn’t need the Mormons to help them out with that.