I don't know much about this guy, but while it makes sense to garner the support of his co-religionists, it also seems clear to me that many, if not most, may dismiss him for linking his campaign to what is often seen as more a "cult" than a church rooted in Christ. Unlike Democrats, who have the dead vote, though, I think the Mormons limit themselves to just baptising the dead.
For clarification, we practice proxy baptism of the living on behalf of the dead.
1 Cor. 15: 29. Else what shall they do which are baptized for the dead, if the dead rise not at all? why are they then baptized for the dead?
Christ went to preach to the dead in spirit prison after his death before his ressurection. Those who accept Him in Spirit Prison need physical baptism done in proxy by the living to enter the Kingdom of God.
1 Peter 3:18-20
For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit: 19 By which also he went and preached unto the spirits in prison; 20 Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.
You may disagre with Mormon Explanation/Interpretation of what baptism for the dead actually means but Paul wrote about it.