Mormons who are convinced the Republican party has values that mirror those of their Church, should take a look at this analysis http://www.wheatandtares.org/2012/09/19/obama-vs-romney-a-mormon-dilemma/ of official Church statements on the issues of: The ideal society, giving to the poor, abortion, marriage, immigration, and freedom of religion.
Of course, legitimate differences of opinion exist within the Church on how to interpret scriptures and the statements of leaders. Certainly, each member has a right and responsibility to make his own decisions on these issues.
Too often, however, Mormons automatically assume the Republican Party reflects Church values on every issue. For example, I’ve met many Mormons who believe the Republican Party stance on abortion is identical to that of the Church. Not true. The current Republican Platform does not permit abortions to protect the life and health of the mother, for pregnancies resulting from rape or incest, or for a severely impaired fetus that will likely not survive birth. These are all exceptions the LDS Church considers valid.
A person who wants her vote to reflect her religious values should do the research and be aware of what her church teaches and how well candidates’ rhetoric matches those teachings.