Romney should be able to count on the votes of Latino Mormons. Many are conservative on social issues and would like to see a Mormon in the White House.
Identities are often overlapping and 'sorting' people into neat piles by one particular label is quite difficult. Take Mormons (traditional vote Republican), Latinos (traditional vote Democrat) and Latino Mormons (??). This last group represents a cultural pattern known as interlocking axes of identity--a fancy term to say that not all people in category X do Y, because identity (both on the individual level as well as the group level) is more complicated than that.