This map shows one of the many religious denominations that are regionally concentrated outside swing states. 

The percentage of Mormons by county:

A very quick scan at this map reveals that with the arguable exception of Nevada virtually all Mormons live in states that are taken for granted in the general presidential election. As a result, members of this denomination are effectively irrelevant in the general presidential election. 

Generally speaking, Mormons vote by a large majority for the same political party and share a common agenda. If the national popular vote picked the president this religious block would get attention from all major party candidates. But instead the winner-take-all electoral college system politically neutralizes members of the Church.