I can handle the fact that he is Mormon. That doesn't bother me. Well, not too much! But if there were already 6 Mormons sitting on the Supreme Court, well, that's another story.
But that is just what we have - only not with Romney and not with Mormon Supreme Court Justices. Vice president Paul Ryan is a committed Catholic who 'attends church regularly' (Paul Ryan's Catholic Roots Reach Deep - WSJ.com). And six - count them - six! - of our Supreme Court Justices are also Catholics (see Six Supreme Court Justices Attend DC Red Mass; Demographics of the Supreme Court)
Can you imagine what Obama could do if 6 of his comrades on the Supreme Court were members of the American Communist Party?