Probably tough for McMullin but I don't know if you guys realize that Lee is not actually popular in Utah. He's being challenged in the primary and last I saw hasn't polled at 50%. Someone correct if I'm wrong of course, but if I was McMullin I'd absolutely be shooting my shot.
McMuffin could barely crack 20% of the vote against Donald J. Trump, the worst Republican fit for Utah in known history.
Also, Mike Lee is an electoral monster in Utah who won 70% of the vote with Trump on the ballot. (Granted, his opponent was literally a transgender running in UTAH).