but also because her fanatical supporters are obnoxious, unreasonable and treat Palin as some infallible, modern day political messiah
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A SP fan CAN be obnoxious, but claiming that THIS could cause non-support is non-credible.
Example: Other candidates have no record of doing X, BUT BECAUSE OF SP’s SUPPORTERS, you will not support SP.
I don’t get this kind of thinking, but you are correct that SP supporters, or the supporters of any cause, should always be respectful and kind.