It really does not matter what they think.
What matters to get elected President is what the American voters think and there are more American voters that have an Unfavorable opinion of Sarah Palin than there are American voters that have a Favorable opinion of Sarah Palin.
Like it or not, them's the facts.
Having a sizable majority of voters have, at the very least, a Favorable opinion of a candidate is the lowest minimum requirement needed to have a sonwball's chance in Hell of getting elected to any office. You may have a Favorable opinion of two candidates but still think that one is much better suited for a public office. You may have a "Favorable" opinion of your neighbor's cat but that does not mean you are going to vote for the cat for Mayor.
If any candidates are so disliked by the American electorate that they actually has more voters with an Unfavorable opinion of them than a Favorable one, those candidate are toast in a Presidential election.
What wins a primary is how favorable the candidate is to republicans, which means that Palin looks good, by the way would you give me the link to that Gallup poll.