Like I said in the Monmouth poll thread, I think the folks here claiming that it's "necessary" for him to get certain endorsements in order to at least finish in the top two in Utah are off the mark. The most important thing is for him to get media exposure, so voters actually know who he is. That Monmouth poll has a whopping 66% of voters having no opinion of him, yet he's still at 20% support. The ideal scenario for him is to have his strong poll #s generate a bunch of news stories about him in Utah, leading much/most of that 66% to become aware of his existence, and then for a respectable chunk of those people to decide to vote for him.
I mean, Trump is at ~70% unfavorable in Utah, so there are a lot of potential voters for McMullin to pick off. That can happen even without any advertising or endorsements.
That might be true, but endorsements from top Utah politicians or Mitt Romney would really help in generating these news.