I'm not Mormon, though the company I work for was founded by Mormons (they hired me), I still have Mormon co-workers today, and for a while one of my state reps (whom I very highly respect) is Mormon. That Romney is Mormon doesn't matter in the least to me, any more than his father's being Mormon mattered when I lived under the latter's governorship.
But Mitt is not his father, and Mitt's conduct of elements of his governorship is why I would be very hard-pressed to vote for him come November.
But I wouldn't worry about the LDS church. Whether Mitt wins or loses, if nobody LDS goes off the deep end and plays the religion card, you all will be seen henceforth as being mainstream Americans. JFK brought previously-suspect Roman Catholics "into the fold": the same will happen here.
So, without my arguing one way or the other, here’s the philosophical question: are Mormons second-class citizens? If fundamentally Romney can’t get nominated because he is a Mormon, does that put a glass ceiling over the heads of Mormons? You argue that JFK brought Catholics into the fold; if Romney can’t win, will the effect be the same, or will the “invalidity” of Mormons for the highest office simply be reinforced by his defeat?