According to this story, a group called Catholics for Obama is calling Catholics and has a standard approach which includes the question:
“1. How can you support a ‘Mormon’ who does not believe in Jesus Christ?”
It is impossible to know how many such calls have been made. Still, I wonder how the media would have responded in 2000 if the Bush campaign had called Gore supporters asking them how they could support a VP candidate, Joe Lieberman, who did not believe in Jesus Christ.