I suspect some of those 11% are Republicans who see Romney as too liberal and will vote libertarian or skip the presidential part of the ballot this year.
You are correct...there are a number of Christians, primarily in the south; who will not vote for Romney because he is seen as too liberal or the fact that he is Mormon. That’s just the way it is...
The percent of “Republicans” not voting for Romney is the same number of “conservatives” that strongly approve of the president. So, they are most likely Lefty liars rather than real conservatives.