Nobody who hopes to ever run for higher office on a Republican ticket is going to mount an independent or third party campaign now.
Sasse isn't noble and isn't dastardly. He's just acting in his own self-interest in not running.
If Romney really is trying to find a #NeverTrump candidate he's going to run up against the fact that nobody who actually has a political future is going to jeopardize it by going against the party's nominee.
Mitt doesn't have much stick-to-itiveness, so he'll get tired soon enough and give up.
“Mitt doesn’t have much stick-to-itiveness, so he’ll get tired soon enough and give up.”
Good observation, which is supported by his past.