What is your estimate of the percentage of the US population that is ‘conservative’ and would vote for a ‘conservative’ candidate ?
That's a question that the bitter-ender Cruz supporters will not ask. They seem to be like a 5-year old who has a thought about how something would be nice and they automatically impress that though to the point where they think everyone else thinks the same thing.
I started out supporting Cruz and sent him lots of money despite knowing his base was fairly finite and that he would need help from Hillary in order to win. Since then, he has alienated a lot of that original base and there are comparatively few who get excited over the prospect of voting for him. Trump is the only real choice/chance we have at this juncture.