There was an interesting article listed at lds.org written by Laurie F. Maffly-Kipp who teaches religious history at the University of North Carolina.  Her article is titled 'A Mormon President?' and was published in The Christian Century Magazine.  It is a good article and I recommend it.

The purpose of the article is to answer fears people have about a potential Mormon President, and to see what Mormonism suggests about the character of such a president.

She has a paragraph near the end that serves as a good summary:

A diffused religious authority, an emphasis on personal agency and responsibility, and a dedicated but wary relationship to the government represent crucial elements of the Mormon gestalt. As I have suggested, however, Mormons are a varied lot, and it would be far too simplistic to think that one could cull specific political implications from a particular doctrine or religious practice. One need only recall the vast territory separating Harry Reid and Orrin Hatch to glimpse the divergent ways that political life can be interpreted and expressed among coreligionists.

I think she makes some excellent points.  Whether or not you vote for Romney should have little to do him being a Mormon.