Indeed, John Adams had strong unitarian beliefs...to most voters at the time, tho, they would have deemed him as "Congregational" [one of the strongest Christian churches in Pasadena, CA -- to this day -- is Lake Avenue Congregational Church]...Adams was Congregational growing up and was the lone church he was associated with as an adult...
My point here is that most voters would not have been aware of his Unitarian beliefs for them to evaluate him as such.
Romney, by contrast, in an Internet world, has no such "luxury" for hiding his Lds beliefs...tho there's plenty of compromisers on FR and elsewhere -- including the Billy Graham Evangelistic Asso Web site...that are doing their darndest to tuck those beliefs away and out of eyesight!
I will not be voting for Romney for a variety of reasons, but I can afford to be noble--I live in CA, which is unwinnable
We will not have the Kingdom of God until the King returns.
Having said that, America is the greatest expression in history of how a predominantly Christian or Judeo-Christian based society can flourish and be a blessing to the world, providing more freedom for more people in more ways than any other example--God bless may God bless America...