It isn't so much the politicians - it's PACS and action groups.
If someone was totally outraged about a Mormon running for office, we had that case a couple of years ago about Warren Jeffs and plural marriage. There is nothing to stop some action group from hammering on that - it isn't libel since they are not associating it with a candidate, it was a real case, but it makes people associate this nonsense with all Mormons by inference. The same goes for other religions.
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